JP2011038383A - Filtration apparatus for warm water swimming pool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain pool water in an extremely clear condition while reducing the cloudiness of pool water in a condition of being used by many people, and to reduce the power consumption of a filter pump to reduce a running cost. <P>SOLUTION: This filtration apparatus for a warm water swimming pool includes a filter 2 filtering circulated pool water; the filter pump 3 circulating the pool water to the filter 2; a coagulant adding apparatus 4 adding a coagulant into the pool water circulated by the filter pump 3; and a heater 5 heating the pool water to a set temperature. The filtration apparatus for the warm water pool adds the coagulant by the adding apparatus 4 into the pool water circulated by the filter pump 3, and filters the pool water with the coagulant added, by the filter 2 to circulate the pool water to the pool 1. The filtration apparatus for the warm water pool includes an inverter 7 controlling the rotating speed of the filter pump 3, and the rotation of the filter pump 3 is controlled by the inverter 7 to control the amount of circulating water for circulating the pool water to the filter 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a filter device for a hot water pool that heats pool water of a hot water pool to a set temperature and circulates it in a filter to keep it clear.

An apparatus has been developed that circulates pool water from a hot water pool through a filter to keep it clear. (See Patent Document 1)
The hot water pool of this publication keeps the pool water at a set temperature with a heat exchanger and keeps the pool water in a clear state by circulating it through a filter with a filtration pump. The filtration device described in this publication has a drawback that the hot water pool cannot always be kept clear. This is because when the number of people who use the hot water pool increases, the circulating water amount of the pool water becomes insufficient and it becomes cloudy. In this state, the pool water becomes cloudy because the concentration of chlorine added for sterilization decreases, the microorganisms that have been inactivated by chlorine are activated, and a large amount of the adhering to the body surface. This is because many pollutants are added.

JP 2003-336901 A

  In order to prevent a decrease in chlorine concentration when the hot water pool is used by a large number of people, it is effective to increase the circulating water amount of the filtration pump. However, in order to increase the amount of circulating water in the pool water, it is necessary to increase the power consumption of the filtration pump, which increases the running cost. Furthermore, the flow rate of the pool water passing through the filter is too high, and foreign matter cannot be filtered clearly. For example, a sand filter having a diameter of about 1.5 meters is generally used as a filter for a 25 meter hot water pool. An optimum filtration pump for filtering the pool water with this sand filter is driven by a motor having a power consumption of 5.5 kW to 7.5 kW. However, if the pool water is circulated to the filter with this filter pump, the problem that the pool water becomes cloudy when used by a large number of people at one time cannot be solved. In order to prevent this problem, a filtration pump driven by a motor as large as 11 kW is currently used. However, the pool water circulated to the filter by such a large filter pump cannot be filtered neatly by the filter, and has a drawback that it cannot be filtered into a highly transparent pool water even when the number of users is small.

  The present invention has been developed for the purpose of solving the above drawbacks. An important object of the present invention is to keep the pool water in an extremely clear state while reducing the cloudiness of the pool water in a state where it is used by a large number of people, while reducing the power consumption of the filtration pump and reducing the running cost. An object of the present invention is to provide a filtration device for a hot water pool.

Means for Solving the Problems and Effects of the Invention

  The filtration device for a hot water pool according to the present invention includes a filter 2 that circulates and filters the pool water, a filtration pump 3 that circulates the pool water through the filter 2, and a pool water that is circulated by the filtration pump 3. A coagulant adding machine 4 for adding the agent and a warming machine 5 for heating the pool water to a set temperature. The filtration device for the hot water pool adds the flocculant to the pool water circulated by the filtration pump 3 by the adder 4, filters the pool water to which the flocculant is added by the filter 2 and circulates it to the pool 1. . The hot water pool filtration device includes an inverter 7 that controls the rotation speed of the filtration pump 3, and the inverter 7 controls the rotation of the filtration pump 3 to control the amount of circulating water that circulates the pool water to the filter 2. is doing.

  The above-mentioned hot water pool filtration device can reduce the cloudiness of pool water in a state where it is used by many people, while making the pool water extremely clear, and also reduces the power consumption of the filtration pump to reduce running costs. There are features that can be done. In a state where a large number of people are used, the rotation speed of the filtration pump is increased to increase the amount of circulating water. In a state where the number of users is small, the rotation speed of the filtration pump is decreased. This is because it can be filtered neatly with a filter. When the number of circulating water is increased by increasing the number of rotations of the filtration pump when used by a large number of people, more pool water is circulated through the filter and chlorine is added to the pool water that is circulated in large quantities. The chlorine concentration in the hot water pool can be increased. For this reason, it can prevent that microorganisms are activated in a warm water pool, and can prevent cloudiness. In addition, since the amount of pool water circulated through the filter increases, the ability of the filter to remove fine foreign matter is reduced, but the amount of water passing through increases, so that the foreign matter largely agglomerated with the flocculant Is more efficiently removed. Therefore, in a state where a large number of people are used, even if the transparency is slightly lower than in a state where the number of users is small, it does not become cloudy and moreover, the pool water can be filtered extremely clearly compared with the conventional filtration device. Features are realized. By the way, the filtration device of the present invention uses a sand filter having a diameter of 1.5 meters in a 25-meter pool, and uses a filtration pump driven by an 11 kW motor, while in a normal use state. The turbidity of the pool water can be maintained at a very high transparency of 0.5 or less, and even in a state where it is used by many people, the pool water can be prevented from becoming clouded and the increase of general bacteria can be prevented. .

  In addition, conventional hot water pool filtration devices have the disadvantage that they cannot be clarified even when the number of users decreases afterwards because it takes a very long time to eliminate cloudiness when used by many people. It was. For this reason, for example, when the pool water becomes cloudy when the conventional apparatus is used by a large number of people at a specific time during the daytime, there is a drawback that the pool water cannot be clarified even if the number of users decreases thereafter. The filtration device of the present invention can effectively prevent white turbidity in a state where it is used by a large number of people and can be filtered beautifully with a filter when the number of people is small. There is a feature that can be made very clear. In addition, since the time period during which the filtration pump increases the amount of circulating water is specified when the number of users increases, the power consumption used by the filtration pump can be considerably reduced and the running cost can be significantly reduced. Is done.

The filtration device for a hot water pool of the present invention includes a turbidity sensor 12 that detects turbidity on the inflow side of the filter 2, and the rotation speed of the filtration pump 3 with the turbidity detected by the turbidity sensor 12 by the inverter 7. Can be controlled.
In the above filtration device, the inverter controls the number of rotations of the filtration pump by the turbidity of the pool water detected by the turbidity sensor provided on the inflow side of the filter. When the turbidity of the pool water increases, the filtration pump increases the amount of circulating water, and without having to manually control the rotation speed of the filtration pump, there is a feature that it can be kept clear while always preventing white turbidity of the hot water pool .

The filtration device for a hot water pool of the present invention includes a turbidity sensor 12 for detecting the turbidity on the suction side and the discharge side of the filter 2, and the filtration pump 3 with the turbidity detected by the turbidity sensor 12 by the inverter 7. The number of rotations can be controlled.
In the above filtration device, the inverter controls the rotation speed of the filtration pump by the turbidity of pool water detected by both turbidity sensors provided on the inflow side and the discharge side of the filter. And the turbidity of pool water by the number of users can be detected, and the circulating water volume of the filtration pump can be controlled to the optimum value. For this reason, there is a feature that the number of rotations of the filtration pump can be controlled to an ideal state and the hot water pool can be kept extremely clear while preventing white turbidity.

The filtration device for a hot water pool according to the present invention includes a pressure sensor 13 for connecting the filter 2 to the discharge side of the filter pump 3 and detecting the pressure on the discharge side of the filter pump 3 and the suction side of the filter 2. Thus, the inverter 7 can control the rotation speed of the filtration pump 3 with the signals of the pressure sensor 13 and the turbidity sensor 12.
The above filtration device detects both the pressure on the suction side of the filter and the turbidity of the pool water and controls the rotation speed of the filtration pump. Therefore, the pressure loss of the filter, that is, the clogged state of the filter The rotational speed of the filtration pump can be controlled to an optimum value in both turbidity. For this reason, there is a feature that the pool water can be clarified both in a state where the filter is washed and in a state where the filter is clogged.

In the hot water pool filtration apparatus of the present invention, the inverter 7 includes a control circuit 14 that controls the rotation speed of the filtration pump 3, and the control circuit 14 uses the signals of the pressure sensor 13 and the turbidity sensor 12 to filter the filtration pump 3. The memory 15 for storing the rotational speed information for specifying the rotational speed of the filter pump 3 can be provided, and the rotational speed of the filtration pump 3 can be controlled by the signals of the pressure sensor 13 and the turbidity sensor 12 based on the rotational speed information.
In the above filtration device, the inverter control circuit determines the rotation speed of the filtration pump based on the stored rotation speed information from both the pressure detected by the pressure sensor and the turbidity detected by the turbidity sensor. Control to the optimum value. For this reason, there is a feature that the pool water can be filtered in an ideal state with a filter and kept in the most beautiful state.

The filtration device for a hot water pool of the present invention can connect a sterilization device 6 for pool water in the middle of a circulation path 9 circulated by a filtration pump 3. The sterilizer 6 includes a salt addition machine 19 that adds salt to pool water, and an electrolysis tank 20 that electrolyzes pool water to which salt is added by the salt addition machine 19. However, the pool water to which salt is added can be electrolyzed in the electrolysis tank 20 to sterilize the pool water to be circulated.
The above filtration device controls the sterilizing power of the pool water with the salt addition machine and the electrolysis tank, and can control the circulating water amount to the optimum value with the filtration pump. The decrease in free chlorine concentration can be reduced. For this reason, even in a state where a large number of people are used, it is possible to more effectively prevent microorganisms from being activated and the pool water from becoming cloudy.

It is a schematic block diagram of the filtration apparatus of the hot water pool concerning one Example of this invention. It is a schematic block diagram of the filtration apparatus of the hot water pool concerning the other Example of this invention. It is a schematic block diagram of the filtration apparatus of the hot water pool concerning the other Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a hot water pool filtration device for embodying the technical idea of the present invention, and the present invention does not specify the hot water pool filtration device as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The hot water pool filtration device shown in FIG. 1 includes a filter 2 that circulates and filters the pool water, a filtration pump 3 that circulates the pool water through the filter 2, and pool water that is circulated by the filtration pump 3. A coagulant adding machine 4 for adding the coagulant, a warming machine 5 for heating the pool water to a set temperature, and a sterilizer 6 for sterilizing the circulating pool water are provided. In this filtering device, a flocculant is added to the pool water by the adder 4, the pool water to which the flocculant is added is filtered by the filter 2, and the pool water circulated by the filtration pump 3 is further filtered by the sterilizer 6. Sterilize and circulate in pool 1. Furthermore, the illustrated filtration apparatus includes an inverter 7 that controls the rotation speed of the filtration pump 3. The inverter 7 controls the rotation of the filtration pump 3 to control the amount of circulating water for circulating the pool water to the filter 2.

  The filter 2 is a sand filter in which the filtration tank 10 is filled with sand 11, and the pool water is passed from the top to the bottom, and the aggregates aggregated with the coagulant are physically filtered and clarified. The size of the filtration tank 10 is adjusted by the size of the hot water pool 1. For example, the filtration tank 10 for filtering the pool water of the 25-meter warm water pool 1 has a diameter of 1.5 m to 2 m, a height of 1 m to 2 m, and is filled with sand 11 as a filter medium. The filter medium sand 11 is backwashed at a rate of once a week, for example, to remove the filtered foreign matter. In the reverse cleaning, the cleaning water is flowed in the reverse direction to the filtration tank 10, that is, the cleaning water is flowed from the bottom to the top, and the sand 11 is stirred with the cleaning water to remove adhering foreign matters. The washing water used for the reverse washing is drained outside without circulating to the hot water pool 1. The filter 2 using sand 11 as the filter medium physically filters the agglomerates aggregated with the aggregating agent and cleans them.

  The filtration pump 3 is connected to the bottom of the pool 1 on the suction side and to the filter 2 on the discharge side. The filtration pump 3 sucks the pool water, supplies it to the filter 2, and circulates the pool water, which has been cleaned by the filter 2, to the pool 1 after passing through the sterilizer 6. The filtration pump 3 is a turbine pump or a centrifugal pump, and includes a motor that rotates the impeller. The filtration pump 3 can control the rotation speed by controlling the voltage and frequency supplied to the motor with the inverter 7. The motor is an AC motor such as an induction motor, and the rotation speed can be controlled by the voltage and frequency of the supplied AC power supply. The AC motor of the filtration pump 3 can reduce the voltage and frequency of the AC power supply to slow the rotation speed, and increase the voltage and frequency to increase the rotation speed. The motor of the filtration pump 3 is 7.5 kW in an 8 course, 25 m hot water pool. However, since the rotational speed of the motor is controlled by the inverter 7, a motor of 5.5 kW to 11 kW can be used. A small motor can increase the frequency and voltage by an inverter to increase the rotation speed, and increase the flow rate of the filtration pump to a flow rate comparable to that of a filtration pump driven by a large motor. However, if a small motor is rotated at a higher speed than the rated frequency of 50 Hz or 60 Hz, the efficiency of the motor and the filtration pump is reduced. Use it like that.

  The adder 4 adds a flocculant such as PAC to agglomerate the contaminated components of the pool water. The flocculant added to the pool water by the adder 4 is not limited to PAC, and any one that can coagulate the contaminating components contained in the pool water can be used. The adder 4 is connected to the suction side of the filter 2 and adds a flocculant to the pool water supplied to the filter 2. The adder 4 adds a flocculant to the suction side or the discharge side of the filtration pump 3 to agglomerate the pollutant components contained in the pool water. The adder 4 preferably adds PAC as a flocculant at a rate of 500 cc / day to 1000 cc / day. Therefore, the addition machine 4 is provided with a constant flow pump, and a constant flow rate flocculant is added to the pool water with this constant flow pump.

  The warmer 5 warms the circulated pool water to a set temperature, for example, 30 ° C. The warmer 5 is a heat exchanger 16 that is heated by hot water or steam supplied from a boiler 17, and the heat exchanger 16 is disposed in the pool water circulation path 9 to heat the pool water to a set temperature. To do.

  The inverter 7 adjusts the voltage and frequency of the AC power supply 18 supplied to the motor of the filtration pump 3 to change the rotation speed of the filtration pump 3 to an optimum value. The inverter 7 increases the voltage and frequency when increasing the rotational speed of the motor. An AC motor such as an induction motor can increase the frequency of the power source to increase the rotation speed of the rotor, so that the frequency is increased when the rotation speed of the motor is increased. When the power supply frequency is increased to increase the rotational speed of the rotor, it is necessary to increase the rotational torque. Therefore, the voltage is increased together with the frequency to increase the rotational torque. On the other hand, when the rotational speed of the motor is lowered, the frequency and voltage are lowered to reduce the rotational torque while lowering the rotational speed. Therefore, the inverter 7 controls the frequency and voltage supplied to the motor together to control the rotational speed of the motor. The inverter 7 can also be manually operated to control the rotation speed of the motor. When the pool 1 is used by a large number of people, the inverter 7 increases the frequency and voltage supplied to the motor to increase the rotation speed of the filtration pump 3, and decreases the frequency and voltage when the number of users is small. Thus, the rotational speed of the filtration pump 3 is lowered.

  The inverter 7 in FIG. 1 controls the rotation speed of the filtration pump 3 based on the turbidity of the pool water detected by the turbidity sensor 12. This apparatus includes a turbidity sensor 12 that detects turbidity on the inflow side of the filter 2. The inverter 7 detects the turbidity of the pool water flowing into the filter 2 with the turbidity sensor 12, and controls the rotation speed of the filtration pump 3 with the detected turbidity. When the turbidity of the pool water detected by the turbidity sensor 12 increases, the filtration device increases the frequency and voltage supplied to the motor of the filtration pump 3 to increase the rotation speed of the filtration pump 3.

  2 includes a turbidity sensor 12 for detecting the turbidity on the inflow side and the discharge side of the filter 2, and the inverter 7 is a turbidity detected by both turbidity sensors 12. The rotational frequency of the filtration pump 3 is controlled by controlling the power supply frequency and voltage supplied to the motor of the filtration pump 3. The inverter 7 controls the power frequency and voltage supplied to the motor of the filtration pump 3 by both the turbidity on the inflow side and the difference between the turbidity on the inflow side and the discharge side. The inverter 7 increases the power frequency and voltage supplied to the motor of the filtration pump 3 as the turbidity on the inflow side increases or the difference between the turbidity on the inflow side and the discharge side increases. The inverter 7 is controlled to increase the power frequency and voltage supplied to the motor of the filtration pump 3 as the value obtained by adding the turbidity on the inflow side and the turbidity on the inflow side and the discharge side increases. You can also

  Furthermore, the filtration device of FIG. 3 includes a pressure sensor 13 for connecting the filter 2 to the discharge side of the filtration pump 3 and detecting the pressure on the discharge side of the filter pump 3 and the suction side of the filter 2. ing. The inverter 7 controls the rotational frequency of the filtration pump 3 by controlling the power frequency and voltage supplied to the motor of the filtration pump 3 by both the pressure detected by the pressure sensor 13 and the signal of the turbidity sensor 12. .

  The inverter 7 includes a control circuit 14 that controls the power supply frequency and voltage supplied to the motor of the filtration pump 3, and supplies the control circuit 14 with the signals of the pressure sensor 13 and the turbidity sensor 12 to the motor of the filtration pump 3. A memory 15 is provided for storing rotational speed information for specifying the power supply frequency and voltage to be used. The memory 15 functions as a function of the rotational speed information specifying the power frequency and voltage supplied to the motor of the filtration pump 3 from the pressure detected by the pressure sensor 13 and the turbidity detected by the turbidity sensor 12 or as a look. I remember it as an uptable. The control circuit 14 supplies power to the motor of the filtration pump 3 based on the pressure detected by the pressure sensor 13 and the turbidity detected by the turbidity sensor 12 based on the rotational speed information stored in the memory 15. The frequency and voltage are specified, and the rotation speed of the filtration pump 3 is controlled to an optimum state. The rotational speed information is stored as information that can clarify the pool water with the optimum rotational speed based on the detected pressure of the pressure sensor 13 and the turbidity detected by the turbidity sensor 12. This rotational speed information is stored in the memory 15 by detecting in advance the state in which the pool water can be clarified most from the pressure and turbidity. For example, in the rotation speed information, when the pressure on the inflow side of the filter 2 is increased, the turbidity on the inflow side of the filter 2 is increased, or the difference in turbidity between the inflow side and the discharge side is increased. The power supply frequency and voltage supplied to the motor of the filtration pump 3 are controlled to be high. However, the ratio of increasing the power supply frequency and voltage supplied to the motor of the filtration pump 3 by the pressure and turbidity is specified based on the rotational speed information.

  Furthermore, the filtration apparatus connects the sterilization apparatus 6 of pool water in the middle of the circulation path 9 circulated by the filtration pump 3. The sterilizer 6 includes a salt adding machine 19 for adding salt to the pool water, and an electrolysis tank for releasing free chlorine for electrolyzing the pool water to which salt is added by the salt adding machine 19 to sterilize the pool water. 20. The salt adder 19 adds salt to the pool water to increase the concentration of chloride ions. The chloride ion is converted to free sterilizing chlorine by electrolysis. Therefore, the amount of salt added can be controlled to control the chloride ion concentration, that is, the concentration of free chlorine having a bactericidal power. The salt adder 19 preferably adds an amount of salt such that the free chlorine concentration in the pool water is 1 mg / L to 5 mg / L. In the electrolysis tank 20, a positive electrode plate 21 and a negative electrode plate 22 are disposed so as to face each other with an insulating film 23 that allows ions to pass therethrough. The plus electrode plate 21 and the minus electrode plate 22 are connected to a DC power source 24. The electrolysis tank 20 attracts negatively ionized chloride ions to the positive electrode plate 21 by electrostatic force, takes electrons from the chloride ions and releases free chlorine having sterilizing power. Sterilize pool water. Therefore, the sterilizer 6 described above electrolyzes the pool water to which salt is added by the salt adding machine 19 in the electrolysis tank 20 and sterilizes the pool water circulated by the liberated chlorine.

  When the hot water pool 1 is used by a large number of people at once, the free chlorine concentration in the pool water decreases. Since the above filtration device increases the amount of circulating water of the filtration pump 3 when used by a large number of people, the sterilizing device 6 connected to the circulation path 9 of the filter 2 can adjust the flow rate of the pool water to be circulated. By adding the proportional salt, the free chlorine concentration in the pool 1 can be prevented from decreasing while the free chlorine concentration in the circulating water is kept constant, and the growth of microorganisms can be effectively prevented. The sterilizer 6 that realizes this includes a flow sensor 25 that detects the flow rate of the pool water circulated through the filter 2, and the salt adder 19 adds to the pool water at the flow rate detected by the flow sensor 25. Control the amount of salt. The salt adding machine 19 can keep the free chlorine concentration constant by adding an amount of salt proportional to the circulating flow rate to the pool water. Note that a water-driven flow rate proportional mixer that integrates the functions of the flow sensor 25 and the chlorine adder 19 may be provided. This filtration device is used by a large number of people without having to increase the free chlorine concentration of the pool water supplied to the hot water pool 1 by filtering it cleanly, that is, making the entire hot water pool 1 more uniform free chlorine concentration. Even in such a state, it has a feature that can effectively prevent the growth of microorganisms. This is important for maintaining the health of users who use the heated water pool 1. When using a large number of people, adding a large amount of chlorine to prevent a decrease in the free chlorine concentration in the hot water pool 1 partially increases the free chlorine concentration, which adversely affects the health of the user. Because it gives.

DESCRIPTION OF SYMBOLS 1 ... Pool 2 ... Filter 3 ... Filtration pump 4 ... Adder 5 ... Heater 6 ... Sterilizer 7 ... Inverter 9 ... Circulation path 10 ... Filtration tank 11 ... Sand 12 ... Turbidity sensor 13 ... Pressure sensor 14 ... Control Circuit 15 ... Memory 16 ... Heat exchanger 17 ... Boiler 18 ... AC power supply 19 ... Salt addition machine 20 ... Electrolysis tank 21 ... Positive electrode plate 22 ... Negative electrode plate 23 ... Insulating film 24 ... DC power supply 25 ... Flow rate sensor

Claims (6)

A filter (2) for circulating and filtering the pool water, a filtration pump (3) for circulating the pool water to the filter (2), and a flocculant in the pool water circulated by the filtration pump (3) A coagulant adding machine (4) to be added, and a heating machine (5) for heating the pool water to a set temperature,
The flocculant is added to the pool water circulated by the filtration pump (3) by the adder (4), and the pool water to which the flocculant is added is filtered by the filter (2) and circulated to the pool (1). It is a filtration device for a hot water pool,
An inverter (7) for controlling the rotation speed of the filtration pump (3) is provided, and the rotation of the filtration pump (3) is controlled by the inverter (7) to circulate pool water to the filter (2). A filtration device for a hot water pool that controls the amount of circulating water.   A turbidity sensor (12) for detecting the turbidity on the inflow side of the filter (2) is provided, and the filtration pump (3) has a turbidity detected by the turbidity sensor (12) by the inverter (7). The apparatus for filtering a hot water pool according to claim 1, wherein the number of rotations is controlled.   A turbidity sensor (12) for detecting the turbidity on the inflow side and the discharge side of the filter (2) is provided, and the filtration pump with the turbidity detected by the turbidity sensor (12) is provided by the inverter (7). The apparatus for filtering a hot water pool according to claim 1, wherein the number of rotations of (3) is controlled.   The filter (2) is connected to the discharge side of the filtration pump (3), and a pressure sensor for detecting the pressure on the discharge side of the filtration pump (3) and the suction side of the filter (2) ( 13), wherein the inverter (7) controls the rotational speed of the filtration pump (3) by signals of the pressure sensor (13) and the turbidity sensor (12). A hot water pool filtration device.   The inverter (7) includes a control circuit (14) for controlling the rotation speed of the filtration pump (3), and the control circuit (14) includes the pressure sensor (13) and the turbidity sensor (12). Is provided with a memory (15) for storing rotational speed information for specifying the rotational speed of the filtration pump (3) with the signal of the pressure sensor (13) and the turbidity sensor (12) based on the rotational speed information. The hot water pool filtration device according to claim 4, wherein the rotation speed of the filtration pump (3) is controlled by a signal.   In the middle of the circulation path (9) circulated by the filtration pump (3), a pool water sterilizer (6) is connected, and this sterilizer (6) is a salt addition for adding salt to the pool water. Machine (19) and an electrolysis tank (20) for electrolyzing the pool water to which salt has been added by the salt addition machine (19), and the pool to which salt has been added by the salt addition machine (19) The apparatus for filtering a hot water pool according to claim 1, wherein water is electrolyzed in an electrolysis tank (20) so that the circulated pool water is sterilized.

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