TW202019830A - water softener - Google Patents

Abstract

The present invention is a water softener (1) for softening water by passing to-be-treated water through an ion-exchange resin (9), the water softener comprising: an ion-exchange resin-filled tank (2) filled with the ion-exchange resin (9); a saltwater tank (4) for storing saltwater (14) for regenerating the ion-exchange resin (9); and a controller (13) for switching between a water softening operation in which water is softened by passing the to-be-treated water through the ion-exchange resin (9) in the ion-exchange resin-filled tank (2), a washing operation in which the interior of the ion-exchange resin-filled tank (2) is washed, a regenerating operation in which the saltwater (14) in the saltwater tank (4) is passed through the ion-exchange resin (9) in the ion-exchange resin-filled tank (2) to regenerate the ion-exchange resin (9), and a water-supplying operation in which water is supplied to the interior of the saltwater tank (4).

Description

water softener

The present invention relates to a water softener for passing water to be treated in an ion exchange resin filled tank filled with ion exchange resin, and performing a water softening treatment.

In the water softener using ion exchange resin, as a means to prevent the inflow of unnecessary water such as backflow to the chemical liquid tank after the power failure is restored, it is configured to determine the chemical liquid valve before starting the position initialization process of the flow path control valve Whether to close, when the chemical liquid valve is in the open state, the control of closing the chemical liquid valve is implemented after the initial processing of the initial position of the chemical liquid valve is performed, and when the chemical liquid valve is closed, the position of the chemical liquid valve is initialized Before the processing, the position initialization processing of the bypass valve, the water inlet valve, and the water collection valve is performed (refer to Patent Document 1). In addition, although the water softener of Patent Document 1 can prevent backflow of the chemical solution valve, etc., there is a problem that if the residual chemical solution is passed through the ion-exchange resin filling tank, the chemical solution is discharged. In addition, when the chemical solution is used, there is a problem that the amount of the chemical solution required for the regeneration process is insufficient and the regeneration of the ion exchange resin is insufficient.

On the other hand, in a water softener using ion exchange resin, if the water to be treated is left in the ion exchange resin filled tank for a long period of time, organic substances and the like are eluted from the ion exchange resin into the ion exchange resin filled tank. In the treated water, the treated water is colored due to such organic substances. Therefore, there is a proposal that if the ion-exchange resin filling tank is not in a water-passing state (hereinafter referred to as "non-water-passing state") for a certain period of time, a water softener that automatically performs the washing operation in the ion-exchange resin filling tank (see Patent Document 2 ). [Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2010-247103 Patent Document 2: Japanese Patent Laid-Open No. 2001-246376

(Problems to be solved by the invention)

However, the water softener proposed in Patent Document 2 performs the washing operation after the non-watering state continues for a certain period of time, so the time period for starting the washing operation differs depending on the starting time of the non-watering state. For example, the washing operation may be started in the evening period when the frequency of passing water is high. If water is passed during the washing operation, there is a problem that the treated water entering from the raw water inlet pipe directly flows out to the soft water outlet pipe. (Technical means to solve problems)

(1) A water softener according to an embodiment of the present invention that solves the above-mentioned problems is a water softener that allows water to be treated to pass through an ion exchange resin to perform a water softening treatment, and includes: Ion exchange resin filled tank, which is filled with ion exchange resin; Brine tank, which is used to store brine for regeneration of ion exchange resin; and The control unit switches the following operations: the dehydration operation is to pass the water to be treated through the ion exchange resin in the ion exchange resin filling tank to perform dehydration; the washing operation is to fill the ion exchange resin The inside of the tank is cleaned; the regeneration operation is to allow the brine in the brine tank to pass water to the ion exchange resin in the ion exchange resin filling tank to regenerate the ion exchange resin; and the water supply operation is to supply water To the inside of the above brine tank; The control unit performs control so as to execute the cleaning operation at a predetermined time. (2) The water softener according to an embodiment of the present invention is preferably the above-mentioned predetermined time from 0am to 6am. (3) In the water softener according to an embodiment of the present invention, the predetermined time may be the same time every day. (4) A water softener according to an embodiment of the present invention is a water softener that allows water to be treated to pass through an ion exchange resin to perform water softening treatment, and includes: Ion exchange resin filled tank, which is filled with ion exchange resin; Brine tank, which is used to store brine for regeneration of ion exchange resin; and The control unit switches the following operations: a dehydration operation, in which the water to be treated is passed through the ion exchange resin in the ion exchange resin filling tank to perform dehydration; a washing operation, in which the ion exchange resin is filled The inside of the tank is washed; the regeneration operation is to allow the brine in the brine tank to pass water to the ion exchange resin in the ion exchange resin filling tank to regenerate the ion exchange resin; and the water supply operation is to supply water To the inside of the above brine tank; The control unit performs control such that the washing operation and the water supply operation are performed immediately after the control unit is supplied with electricity. (Comparing the efficacy of the previous technology)

The water softener of the present invention can be set to perform the washing operation in the ion exchange resin filling tank at a predetermined time every day. Therefore, if the water is passed during the washing operation, the treated water flowing from the raw water inlet pipe will flow out to the soft water outlet pipe, but by setting the predetermined time at the time when the water is not implemented, this kind of bad situation can be prevented occur.

[Composition of water softener] An embodiment of the water softener of the present invention will be described based on the drawings. Refer to Figure 1. The water softener 1 is provided with an ion exchange resin filled tank 2 containing ion exchange resin 9, a control valve 3 that switches the direction of passage of raw water or the like on the ion exchange resin filled tank 2, and a control unit 13 that controls the control valve 3 And a brine tank 4 for storing brine 14 that regenerates the ion exchange resin. Connected to the control valve 3 are: a raw water inlet pipe 5 for supplying raw water, a soft water outlet pipe 6 for supplying soft water, and a drain outlet pipe 7. The brine tank 4 and the ion-exchange resin filled tank 2 are connected and installed via a control valve 3 and a brine pipe 12.

The ion exchange resin filling tank 2 is a bottomed cylindrical container filled with a predetermined amount of ion exchange resin 9. The raw water supplied from the raw water inlet pipe 5 becomes treated water, and flows into the ion exchange resin filling tank 2 via the control valve 3 and the upper filter 10. Then, the treated water passes through the ion-exchange resin filling tank 2 and is subjected to softening treatment to become softened water. The soft water system enters the water collecting pipe 8 from the lower filter 11, passes through the water collecting pipe 8, and flows out of the soft water outlet pipe 6 via the control valve 3.

The upper filter 10 has a filter function that allows the ion-exchange resin 9 not to leak and to pass the water to be treated. Therefore, the size of the opening formed in the upper filter 10 is smaller than the particle size of the ion exchange resin 9. In addition, in order to reduce the pressure loss when passing water, the opening ratio of the upper filter 10 is preferably as large as possible within the allowable range of strength. Similarly, the lower filter 11 has a filter function that allows the ion-exchange resin 9 not to leak out and allows the water to be treated to pass through. Therefore, the size of the opening formed in the lower filter 11 is smaller than the particle size of the ion exchange resin 9. In addition, in order to reduce the pressure loss when passing water, the opening ratio of the lower filter 11 is preferably as large as possible within the allowable range of strength.

The control unit 13 is composed of a control board equipped with a microcomputer that controls various parts of the water softener. The control unit 13 includes a timer A as a timing means for judging whether to start the regeneration operation and cleaning operation of the ion exchange resin 9 described later, a counter that counts the cumulative water flow rate toward the ion exchange resin filling tank 2, and a count A counter of the total water flow rate of the tank 2 filled with ion exchange resin.

[Water softener action] Next, the operation of the water softener 1 configured as above will be described. In addition to the softening operation for supplying soft water, the water softener 1 also performs various operations such as reverse cleaning operation, regeneration operation, forward cleaning operation, and water supply operation. Under the control of the control unit 13 included in the water softener 1, the regeneration operation and the reverse cleaning operation of the ion exchange resin 9 are automatically performed in a timely manner. In addition, in this case, the reverse cleaning operation and the forward cleaning operation are called "cleaning operation".

[Softening operation] The softening operation will be described using FIG. 2. The softening operation is a step of softening the raw water belonging to the treated water. The water to be treated supplied from the raw water inlet pipe 5 flows into the upper filter 10 via the control valve 3, and then flows into the ion exchange resin filling tank 2 downward from the upper filter 10. Then, by the action of the ion exchange resin 9, the water to be treated that belongs to hard water is formed into soft water. Then, soft water flows into the lower filter 11, passes through the water collecting pipe 8, and flows out through the control valve 3 into the soft water outlet pipe 6.

[Reverse cleaning operation] The reverse cleaning operation will be described using FIG. 3. The reverse cleaning operation is a step of discharging water to the ion-exchange resin filling tank 2 in the opposite direction to the dehydration operation, and discharging the foreign matter adhering to the ion-exchange resin 9. The control unit 13 switches the flow path of the control valve 3 so that the raw water from the raw water inlet pipe 5 flows into the lower filter 11 through the water collecting pipe 8 through the control valve 3. Then, the raw water flows from the lower side to the upper side in the ion exchange resin filling tank 2, and then flows into the upper filter 10. Finally, the raw water containing foreign matter is discharged from the drain outlet pipe 7 via the control valve 3.

[Regeneration operation] The regeneration operation will be described using FIG. 4. The regeneration operation is a step of causing brine to flow into the ion exchange resin 9 in the ion exchange resin filling tank 2 and performing the regeneration process of the ion exchange resin 9. The control unit 13 switches the flow path of the control valve 3, and the brine 14 in the brine tank 4 passes through the brine pipe 12 and flows into the upper filter 10 via the control valve 3. Then, the salt water flows downward from the upper filter 10 in the ion exchange resin filling tank 2 to perform regeneration of the ion exchange resin 9. The brine used in the regeneration process of the ion exchange resin 9 flows into the lower filter 11, passes through the water collection pipe 8, and is discharged from the drain outlet pipe 7 via the control valve 3.

[Washing operation] The positive cleaning operation will be described using FIG. 5. The positive washing operation is a step of applying water to the ion exchange resin filling tank 2 in the same direction as the dehydration operation, and washing and discharging the brine remaining in the piping. The control unit 13 switches the flow path of the control valve 3 so that the raw water from the raw water inlet pipe 5 flows into the upper filter 10 via the control valve 3. Then, the raw water flows downward from the upper filter 10 in the ion-exchange resin filling tank 2, flows into the lower filter 11, passes through the water collecting pipe 8, and is discharged from the drain outlet pipe 7 via the control valve 3.

[Water supply operation] The water supply operation will be described using FIG. 6. The water supply operation is a step for generating brine 14 before the regeneration operation of the ion exchange resin 9. The control unit 13 switches the flow path of the control valve 3 and feeds the raw water from the raw water inlet pipe 5 through the brine pipe 12 through the control valve 3 to supply just a predetermined amount of water to the brine tank 4. [Example]

The actual operation sequence of the water softener of the present invention will be described. In addition, the following description exemplifies preferred embodiments of the present invention, but the present invention is not limited to these, and other embodiments can be implemented within the scope of the present invention.

<Embodiment 1> FIG. 7 is a flowchart showing the execution sequence of various operations of the water softener 1 according to the first embodiment. Immediately after the electric supply to the control unit 13 of the water softener 1, the flow path is switched by the control valve 3, and the reverse cleaning operation, the forward cleaning operation, and the water supply operation of the ion exchange resin 9 are sequentially performed (step W1 ). Hereinafter, the operation of step W1 is referred to as "washing and water supply operation". During the washing and water supply operation, the necessary amount of raw water for removing the foreign materials adhering to the ion exchange resin 9 and discharging the residual salt water in the piping is supplied to the ion exchange resin filling tank 2, and then a given amount of raw water is supplied Give brine tank 4.

Therefore, even if a power outage occurs during the water supply operation and is placed in the state where the brine 14 is not supplied in the brine tank 4, the washing and water supply operation is performed immediately after the power is supplied to the control unit 13 after the power outage, which prevents subsequent implementation In the regeneration operation, there is insufficient salt water and insufficient regeneration.

When the washing and water supply operation is completed, the control unit 13 starts to monitor the count of the timer A that has elapsed since the washing and water supply operation ends, and monitors the accumulation of the cumulative value of the water flow rate after the washing and water supply operation ends. The count of the quantity counter (step S1).

In this embodiment, the time at which the regeneration operation or the cleaning operation is started is set as the "set time". In this embodiment, the regeneration operation or the washing operation is set to be carried out during the period from 0 am to 6 am, which is less frequently used, preferably at 3 am. The control unit 13 determines whether the current time is the set time (step S2). If the current time is the set time (the determination in step S2 is "YES"), the process proceeds to step S3. Figure 7 sets the "set time" to 3 am.

In addition, the setting time of step S2 can be changed appropriately according to the frequency of use of the water softener and the like. For example, when the frequency of use at 3 am is high due to night shifts, etc., it may be set to perform the regeneration operation and the washing operation at 3 pm.

The timer A and the cumulative amount counter determine the timing of the regeneration operation of the ion exchange resin 9. In this embodiment, the regeneration operation system is set to be implemented every 9 days or when the cumulative water flow reaches 1.9 tons. The control unit 13 first determines whether the count value of the timer A is less than 9 days (step S3). If the count of the timer A is less than 9 days ("YES" in step S3), then it is determined whether the count value of the accumulated water flow is less than 1.9 tons (step S4).

The set cumulative amount in step S4 can be appropriately changed in accordance with the hardness of the water to be treated. For example, when the hardness of the water to be treated is high, since the amount of water to be treated is reduced, it can also be set to perform the regeneration operation at shorter intervals such as 1.5 tons.

The control unit 13 switches the flow path of the control valve 3 and performs the regeneration operation of the ion exchange resin 9 when the count of the timer A reaches 9 days or more (the determination in step S3 is "NO") (step S6). In this embodiment, the reverse cleaning operation is performed before the regeneration operation, and the normal cleaning operation and the water supply operation are sequentially performed after the regeneration operation. This series of operations in which the reverse cleaning operation, the regeneration operation, the forward cleaning operation, and the water supply operation are performed in this order is called "washing and regeneration water supply operation". Then, when the washing regeneration water supply operation of the ion exchange resin 9 is completed, the control unit 13 resets the count of the timer A and the count of the accumulated amount counter (step S7). The timer A and the cumulative amount counter start counting again (step S1), and measure the elapsed time and the cumulative water flow rate of the ion exchange resin 9 after the regeneration operation.

Furthermore, even if the count of the timer A is less than 9 days (the judgment of step S3 is "YES"), if the cumulative water flow exceeds 1.9 tons (the judgment of step S4 is "NO"), it is the same as As described above, the flow path of the control valve 3 is switched, and the ion exchange resin 9 is washed to regenerate the water supply operation (step S6).

On the other hand, if the elapsed days are less than 9 days (the judgment in step S3 is "YES"), the cumulative water flow is less than 1.9 tons (the judgment in step S4 is "YES"), and there is no water flow in the water softener 1 , The water to be treated in the ion exchange resin filled tank 2 is in a state of staying in the ion exchange resin filled tank 2. If this state continues for a long period of time, the water to be treated will become colored due to organic matter oozing out of the ion exchange resin 9, and therefore the ion exchange resin filled tank 2 must be cleaned. Therefore, the water softener 1 of the present embodiment is that even if the number of days elapsed is less than 9 days (the judgment in step S3 is "YES"), the cumulative water flow is less than 1.9 tons (the judgment in step S4 is "YES"), but if At the set time, the cleaning operation (reverse cleaning operation and forward cleaning operation) in the ion exchange resin filling tank 2 is performed. By performing the washing operation for a predetermined time, the foreign materials adhering to the ion exchange resin 9 are removed, and the ion exchange resin filling tank 2 is supplied with the necessary amount of raw water for discharging the brine remaining in the piping.

In the first embodiment, even if there is a power outage in the middle of regeneration, there may be residual brine in the ion exchange resin filling tank 2. However, since the washing operation is performed immediately after the control unit 13 is supplied with electricity, the ion exchange resin filling can be prevented The brine in the tank 2 flows out from the soft water outlet pipe 6. In addition, since the water supply operation is performed immediately after the control unit 13 is supplied with electricity, it is possible to prevent the situation where the salt water 14 is insufficient and the regeneration is insufficient during the next regeneration operation.

<Reference Embodiment 1> As a reference example of the operation of the water softener 1, the reference embodiment 1 will be described. FIG. 8 is a flowchart showing the implementation sequence of the first embodiment. The difference between the reference embodiment 1 and the above-mentioned embodiment 1 is that the reference embodiment 1 adds a process of determining whether to perform the washing water supply operation using the total water flow value before performing the washing water supply operation. Except for this additional processing, the rest are common to the first embodiment. Therefore, the common parts are denoted by the same component symbols and their description is omitted.

As shown in FIG. 8, according to the first embodiment, immediately after power is supplied to the control unit 13 of the water softener 1, the control unit 13 starts monitoring the count of the total water flow counter of the accumulated water flow rate (step W1 ).

The total water flow counter is continuously accumulated under the amount of water passed to the water softener 1 without resetting, and then the timing of the washing and water supply operation is determined. In the first embodiment, it is assumed that the water flow rate used in the washing operation immediately after the water softener 1 is installed in an ordinary household is set to 100 L or more. The control unit 13 judges whether or not the count value of the total water flow rate exceeds 100 L (step W2). If the total water flow counter is less than 100L (the determination in step W2 is "NO"), step W3 is skipped and the process proceeds to step S1. If the total water flow counter reaches 100L or more (the determination in step W2 is "YES"), the process proceeds to step W3, and then proceeds to step S1. At step W3, the flow path is switched by the control valve 3, and the washing water supply operation is performed. Accordingly, the reason for selecting whether to perform the washing and water supply operation in step W3 in accordance with the cumulative value of the water flow immediately after the power supply to the control unit 13 is as follows.

First, before the water softener 1 is installed in an ordinary home, the assembly line of the water softener 1 is supplied with electricity to perform a power-on inspection. If the cleaning and water supply operation is performed during the period of conducting the power-on inspection, the power-on inspection must wait for the period before the cleaning and water supply operation is completed, resulting in poor inspection efficiency. Therefore, by observing the water flux accumulated by the total water flux counter, the water softener 1 should not be subjected to the washing and water supply operation during the period when the total water flux of the ordinary household before the water softener 1 is installed is small, and the power supply inspection can be performed efficiently.

On the other hand, the water softener 1 is installed in an ordinary home, and after the user starts to use it, it is necessary to perform the washing and water supply operation immediately after the control unit 13 is supplied with electricity. Therefore, the amount of water used in the washing operation immediately after installation in an ordinary home is set as an index, and if the total water flow rate exceeds the index value, the washing and water supply operation is performed immediately after power is supplied to the control unit 13. In this reference form 1, the index amount is set to "100L". Accordingly, when the washing operation performed immediately after the installation is completed and the user starts to use it, the washing and water supply operation is performed immediately after power is supplied to the control unit 13.

In addition, the total water flow rate in step W2 can be appropriately changed in accordance with the water flow rate of the washing operation performed immediately after the construction of the water softener 1 and the like. For example, when the amount of ion exchange resin 9 in the ion exchange resin filling tank 2 is small and the water flow rate in the washing operation can be reduced, the total water flow rate may be set to 50 L.

<Embodiment 2> FIG. 9 is a flowchart showing the sequence of various operations of the water softener 1 according to the second embodiment. In addition, the flow charts and contents related to Embodiment 1 are common, and are not repeated here.

Immediately after supplying electric power to the control unit 13 of the water softener 1, the control unit 13 starts monitoring the elapsed time of the timer A since the end of the washing water supply operation, and monitors the amount of water passing after the end of the washing water supply operation The accumulated value of the accumulated value counter is counted (step S1). Step S2 is the same as the first embodiment. In addition, if the frequency of use is different for each day of the week, the set time can also be changed according to each day of the week. For example, Monday may be set at 4 am, Tuesday may be set at 5 am, etc. The following steps are the same as in the first embodiment.

Since the second embodiment operates as described above, if the daily set time is reached (the judgment in step S2 is "YES"), proceed to step S5 or step S6 to perform the reverse cleaning operation and the forward cleaning operation. That is washing operation.

<Water quality measurement> In order to confirm whether it is sufficient to perform the washing operation every 24 hours, the water quality of the stagnation water in the ion exchange resin filled tank 2 was measured. The measured water quality items are turbidity, color and chemical oxygen demand. The turbidity and chromaticity were measured using WATER ANALYZER WA6000 manufactured by Nippon Denshoku Industries Co., Ltd. The chemical oxygen demand (hereinafter referred to as "COD") is measured by titration of CODMn value according to JIS K 0102-17 titration method.

The original water system uses RO water with a pH of 7.5±0.5, fills the ion exchange resin filled tank 2 with RO water, and fills the brine tank 4 with brine 14. Next, the washing regeneration water supply operation of the second embodiment described above is set to one cycle, and two cycles are performed. Then, 2 L of RO water was flowed into the ion exchange resin filling tank 2 from the raw water inlet pipe 2, and then the water flowing out of the soft water outlet pipe 6 was collected. This water was used as the raw water of the immersion liquid, and the water quality of the raw water of the immersion liquid was measured.

In addition, the relative chromaticity, turbidity, and CODMn increase are based on different countries. For example, the chroma increase is less than 5.0 degrees, the turbidity increase is less than 0.5 degrees, and the CODMn increase is 2.0. Countries with mg/L or less as benchmarks.

(Experiment 1) Perform 2 cycles of washing and regenerating water supply operation, and leave it for 24 hours. After 24 hours, in order to collect the stagnation water in the ion exchange resin filling tank 2, 2L of RO water was flowed into the ion exchange resin filling tank 2 from the raw water inlet pipe 2, and then the water flowing out of the soft water outlet pipe 6 was collected. The water quality of this water was measured, the water quality after 24 hours was compared with the water quality of the raw water of the immersion liquid, and the increase in color, turbidity, and CODMn was measured. The increase in color, turbidity, and CODMn are all very small values. The increase in color, turbidity, and CODMn are summarized in Table 1. Meet the above criteria.

(Experiment 2) The chromaticity, turbidity, and increase in CODMn were measured in the same manner as in Experiment 1, except for 72 hours. The increase in color, turbidity, and CODMn are all greater than the result after 24 hours. The increase in color, turbidity, and CODMn are summarized in Table 1. The above criteria are not met. [Table 1]

The present invention has been described with reference to detailed specific implementations, but various changes and modifications can be added without departing from the spirit and scope of the present invention, which can be easily considered by those skilled in the art.

This application is based on the Japanese patent application filed on September 6, 2018 (Japanese Patent Application 2018-166656) and the Japanese patent application filed on September 12, 2018 (Japanese Patent Application 2018-170399). , Referring to its content and citing in this case. (Industry availability)

According to the present invention, it can be set that the washing operation in the ion-exchange resin filling tank is carried out at a predetermined time every day. Although the water to be treated flowing from the raw water inlet pipe flows out to the soft water outlet pipe when water is passed during the washing operation, However, by setting the predetermined time to a time period during which water is not passed, it is possible to exert the effect of providing a water softener that can prevent such a bad situation. The present invention that exerts this effect can be effectively used as a water softener that allows water to be treated to pass through an ion-exchange resin-filled tank filled with an ion-exchange resin and to perform a water-softening treatment.

1: Water softener 2: Ion exchange resin filled tank 3: Control valve 4: brine tank 5: Raw water inlet pipe 6: Soft water outlet pipe 7: Drain outlet pipe 8: Water collecting pipe 9: ion exchange resin 10: Upper filter 11: Lower filter 12: brine tube 13: Control Department 14: brine

1 is a schematic configuration diagram showing an embodiment of the water softener of the present invention; FIG. 2 is a schematic diagram showing the flow of water during the softening operation of the water softener of FIG. 1; Figure 3 is a schematic diagram showing the flow of water during the reverse cleaning operation of the water softener of Figure 1; 4 is a schematic diagram showing the flow of water during the regeneration operation of the water softener of FIG. 1; FIG. 5 is a schematic diagram showing the flow of water during the washing operation of the water softener of FIG. 1; 6 is a schematic diagram showing the water flow of the water softener of FIG. 1 during water supply operation; 7 is a flowchart showing the implementation sequence of the washing water supply operation, washing regeneration water supply operation, and washing operation in Embodiment 1; 8 is a flowchart showing the implementation timing of the cleaning water supply operation, cleaning regeneration water supply operation, and cleaning operation with reference to Embodiment 1; and FIG. 9 is a flowchart showing the implementation sequence of the washing regeneration water supply operation and the washing operation in the second embodiment.

Claims (4)

A water softener is a water softener that allows treated water to pass through ion exchange resin to perform water softening treatment, and includes: Ion exchange resin filled tank, which is filled with ion exchange resin; Brine tank, which is used to store brine for ion exchange resin regeneration; and The control unit switches the following operations: the dehydration operation, which allows the water to be treated to pass through the ion exchange resin in the ion exchange resin filling tank, to perform dehydration; the washing operation, which converts the ion exchange resin The inside of the filling tank is washed; the regeneration operation is to allow the brine in the brine tank to pass water to the ion exchange resin in the ion exchange resin filling tank to regenerate the ion exchange resin; and the water supply operation is to replace the water Supply to the inside of the above brine tank; The control unit performs control so as to execute the cleaning operation at a predetermined time. For example, the water softener according to claim 1, wherein the above-mentioned predetermined time is a period from 0am to 6am. For example, the water softener according to claim 1 or 2, wherein the predetermined time is the same time every day. A water softener is a water softener that allows treated water to pass through ion exchange resin to perform water softening treatment, and includes: Ion exchange resin filled tank, which is filled with ion exchange resin; Brine tank, which is used to store brine for ion exchange resin regeneration; and The control unit switches the following operations: the dehydration operation, which allows the water to be treated to pass through the ion exchange resin in the ion exchange resin filling tank, to perform dehydration; the washing operation, which converts the ion exchange resin The inside of the filling tank is washed; the regeneration operation is to allow the brine in the brine tank to pass water to the ion exchange resin in the ion exchange resin filling tank to regenerate the ion exchange resin; and the water supply operation is to replace the water Supply to the inside of the above brine tank; The control unit performs control in such a manner that the washing operation and the water supply operation are performed immediately after power is supplied to the control unit.

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