JP2004255325A - Water quality adjusting type filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water quality adjusting type filter capable of effectivcely controlling bacteria of treated water and capable of reducing a production cost for the control of bacteria. <P>SOLUTION: This water quality adjusting type filter is constituted so that raw water is passed through a filter part 28 filled with an ion exchange resin 30 to be subjected to partial water softening treatment. An H-type one is used as the ion exchange resin 30 to bring treated water to an acidic state of a predetermined level. Separate filtering parts 32 and 35 for eluting silver ions with respect to the treated water are provided on the downstream side of the filter part 28. The filtering parts 32 and 35 are filled with activated particles 32a and 35a coated with silver not only to elute silver ions to the treated water but also to impart bacteria control action to the treated water. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water quality control type filter that removes a cation, which is a hardness component, from a raw water such as tap water to a predetermined value and softens water using an ion exchange resin.
[0002]
[Prior art]
Conventionally, as a water quality adjusting type filter of this type, a filtration unit made of an ion exchange resin and a filtration unit made of granular activated carbon are provided, and raw water is passed through those filtration units to soften the raw water, A device configured to purify and filter is known. In this water quality control type filter, in the filtration layer made of granular activated carbon, foreign substances and the like contained in raw water such as tap water are removed and, at the same time, calcium is also removed, so that various bacteria can easily propagate in the filtered treated water. Become.
[0003]
[Problems to be solved by the invention]
By the way, in an ice making machine for making cube ice or the like, drain water containing a large amount of calcium, silica, etc., without being used for ice making, accumulates in a drain of the ice making machine, that is, a water dish, and is then discharged. Is done. Then, during this discharging process, excessive calcium or silica contained in the drain water may adhere to the water dish and generate a mud-like scale. Then, when bacteria or bacteria attach thereto, they grow as slimy slime. Since the drain water discharge system of the ice making machine is not completely shut off from the outside air, the environment in which dust, bacteria and bacteria in the air are liable to be mixed into water is created, which leads to an increase in bacteria. In some cases, slime clumps that grow in the water dish in a water dish due to the growth of bacteria may enter ice stockers, which are ice storage cases, together with ice.
[0004]
Therefore, in such a case, the flavor of the cube ice may not only be reduced, but also a problem may occur in terms of hygiene.
In order to prevent the generation of the bacteria and bacteria, it is necessary to acidify the water supply for the ice maker to increase the solubility of scale substances such as calcium and silica, thereby eliminating the growth nuclei of the bacteria and bacteria. . However, the treated water used for beverages such as cubic ice has a limited acidity.
[0005]
The present invention has been made by paying attention to the problems existing in such a conventional technique. An object of the present invention is to provide a water-quality-adjustable filter capable of effectively controlling bacteria in treated water and reducing the production cost for the bacteria control.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a water quality adjustment type filter in which raw water is passed through a filtration unit filled with a filter medium made of an ion exchange resin to soften the raw water. In the above, an H type resin is used as the ion exchange resin, and silver ion elution means for eluting silver ions with respect to the acidic treated water is provided on the downstream side of the filtration unit. Things.
[0007]
Therefore, according to the first aspect of the present invention, when the raw water passes through the filtration section, the cations are removed by the filter medium made of the ion exchange resin and the water is softened. In this case, since the ion exchange resin is H-type, the softened treated water is acidified. Therefore, silver ions are effectively eluted into the treated water from the silver ion elution means on the downstream side of the filtration unit. Accordingly, calcium, some silica, and the like have high solubility in acidic treated water, and thus are difficult to scale. In addition, since silver ions have an effective bacteriostatic action, the growth of bacteria and bacteria is suppressed. In addition, as the silver ion eluting means, for example, activated carbon or the like only needs to carry silver, the number of parts does not increase, and the manufacturing cost of the water quality adjusting type filter can be suppressed.
[0008]
According to a second aspect of the present invention, in the first aspect of the invention, the silver ion eluting means is activated carbon having a silver coating.
Therefore, according to the second aspect of the present invention, the impurities are absorbed and filtered by the activated carbon, and the silver ions are eluted from the activated carbon. The activated carbon is appropriately selected from granular, fibrous, and sheet-like activated carbon.
[0009]
According to a third aspect of the present invention, in the first or second aspect, an adjusting means for adjusting the amount of the silver ions eluted is provided.
[0010]
Therefore, according to the third aspect of the present invention, the elution amount of silver ions can be controlled, and the bacteriostatic function can be appropriately adjusted. Here, the elution amount of silver ions includes both the total elution amount and the elution amount per unit water amount.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1st Embodiment)
First, a first embodiment will be described with reference to FIGS.
[0012]
As shown in FIG. 1, a storage case 11a of the water quality adjusting type filter 11 is formed in a cylindrical shape with a bottom, and a lid 12 is detachably attached to a top opening of the filter 11 through a packing 13 by a stopper 14. Have been. At a position deviated from the center of the top wall of the lid 12, a cylindrical inlet 15 through which raw water flows is provided. At the center of the top wall of the lid 12, a cylindrical outlet 16 for discharging the partially softened treated water after filtration is disposed, and a female screw 16a is formed on the inner peripheral surface thereof. . The water quality adjusting type filter 11 of the first embodiment is incorporated in, for example, an ice making circuit.
[0013]
A cartridge 17 is detachably attached to the lower surface of the lid 12 in a hanging state, and the cartridge 17 is provided with predetermined gaps in the upper, lower and peripheral sides between the cartridge 17 and the housing case 11a. Are housed in the housing case 11a. That is, a cylindrical outlet 18 protrudes from the center of the upper end of the cartridge 17, and a male screw 18a is formed on the outer peripheral surface thereof. Then, by screwing the male screw 18a into the female screw 16a, the outlet 18 of the cartridge 17 is connected to the outlet 16 of the lid 12, and the cartridge 17 is fixed down to the lid 12.
[0014]
As shown in FIG. 1, the cartridge 17 includes a cylindrical main body case 19, an upper lid 20 screwed to an upper end of the main body case 19, and a lower lid 21 screwed to a lower end of the main body case 19. And The outlet 18 is integrally formed at the center of the upper surface of the upper lid 20 so as to protrude.
[0015]
A shelf plate 22 having a plurality of through holes 22a is provided at a lower portion in the main body case 19, and a filter 24 made of a nonwoven fabric is provided on an upper surface thereof by a holder 23 having a cylindrical communication port 23a at the center. Have been. A cylindrical upper case 25 with a bottom is disposed in the upper part of the main body case 19, and a cylindrical communication port 25a is protruded from the center of the lower surface of the bottom wall. A partition wall 25b protrudes concentrically from the inner surface of the bottom wall of the upper case 25, and a plurality of through-holes 25c are formed in the outer peripheral edge of the bottom wall outside the partition wall 25b.
[0016]
A bypass pipe 26 is provided between the communication port 23 a of the holder 23 and the communication port 25 a of the upper case 25. Below the bypass pipe 26, a flow rate adjusting mechanism 27 as an adjusting means is disposed on the lower lid 21, and the raw water flowing into the storage case 11 a from the inflow port 15 is supplied to the cartridge via the flow rate adjusting mechanism 27. The main body case 19 is taken in. At this time, the flow rate adjusting mechanism 27 adjusts the flow rate of the raw water introduced into the outside and the inside of the bypass pipe 26.
[0017]
As shown in FIG. 1, a first filtration unit 28 and a second filtration unit 29 are provided inside the main body case 19 outside the bypass pipe 26. The first filtration unit 28 is filled with an H-type ion exchange resin 30 having hydrogen ions via a second filtration unit 29 and a filter 31 made of a nonwoven fabric. The second filtration unit 29 is configured by filling granular activated carbon 29a.
[0018]
The ion exchange resin 30 is filled with a bead-shaped cation resin. Then, the raw water is filtered in the second filtration unit 29 after removing residual chlorine contained therein. Subsequently, the cation (mineral component), which is a hardness component, is removed to a predetermined value by the ion exchange resin 30 of the first filtration unit 28 to soften the raw water, and the raw water is mixed with raw water filtered water to obtain a pH value. (PH) is adjusted to about 5.5 to 7.0, usually about 6.5.
[0019]
As shown in FIGS. 1 and 2, a third filtration unit 32 is provided downstream of the first filtration unit 28 via a filter 33 made of a nonwoven fabric, outside the bypass pipe 26 and the upper case 25. . The third filtration section 32 is filled with granular activated carbon 32a formed by coating a bacteriostatic agent made of silver or a silver compound (hereinafter, simply referred to as silver). Then, the treated water filtered and softened in the first filtration unit 28 and the second filtration unit 29 passes through the third filtration unit 32, thereby forcing silver ions from the silver coating of the granular activated carbon to the acidic treatment water. To be eluted and controlled.
[0020]
A plurality of ribs 34 project from the lower surface of the bottom wall of the upper case 25, and the lower ends of the ribs 34 are in contact with a filter 33 between the third filtration unit 32 and the ion exchange resin 30. The ribs 34 maintain the volume of the storage section of the third filtration section 32 at a constant size regardless of the amount of the granular activated carbon 32a, and hold the filter 33 in position.
[0021]
As shown in FIG. 1, the outer space of the partition wall 25b in the upper case 25 is filled with a fourth filtration unit 35 filled with granular activated carbon via a filter 36 made of a nonwoven fabric. The inside of the partition wall 25b of the upper case 25 is filled with a fifth filtration portion 38 filled with granular activated carbon via a filter 39 made of a nonwoven fabric. The granular activated carbons 35a and 38a of the fourth filtration unit 35 and the fifth filtration unit 38 are also coated with a bacteriostatic material made of silver.
[0022]
As described above, since the third filtration unit 32, the fourth filtration unit 35, and the fifth filtration unit 38 are made of granular activated carbon, they have a function of filtering foreign substances.
A cover plate 40 having a plurality of through holes 40a is attached to the upper end opening of the upper case 25 via a filter 41 made of nonwoven fabric.
[0023]
The odor of the ion exchange resin is removed by passing the treated water treated in the first filtration unit 28 through the third and fourth filtration units 32 and 35. Also, the raw water introduced into the upper case 25 passes through the fifth filtration unit 38 via the bypass pipe 26 without passing through the first and second filtration units 28 and 29, and is included in the raw water. Foreign matter, bacteria, etc. are removed and filtered. Accordingly, the acidity of the raw water introduced from the bypass pipe 26 into the fifth filtration unit 38 is not adjusted. Then, when the raw water and the treated water pass through the third and fourth filtration units 32 and 35, silver ions are eluted into the raw water and the treated water. Therefore, in this embodiment, the third and fourth filtration units 32 and 35 constitute a silver ion eluting unit. The granular activated carbon 38a of the fifth filtration unit 38 is also provided with a silver coating, which is mainly intended to suppress the propagation of various bacteria in the fifth filtration unit 38.
[0024]
As shown in FIGS. 3 and 4, in the flow rate adjusting mechanism 27, a support cylinder 42 protrudes from the center of the inner surface of the bottom wall of the lower lid 21, and a pair of inlets 42 a is formed on the outer surface thereof. . An adjustment cylinder 43 is rotatably fitted in the support cylinder 42, and a plurality of adjustment holes 43 a capable of communicating with an intake port 42 a of the support cylinder 42 are formed on a peripheral surface thereof. An operating body 44 for rotating the adjusting cylinder 43 is attached to a lower end of the adjusting cylinder 43.
[0025]
Then, with the cartridge 17 taken out of the storage case 11a, the adjusting cylinder 43 is rotated by the operating body 44, so that the inlet of the support cylinder 42 is inserted as shown in FIGS. The angle formed by the adjustment hole 43a of the adjustment cylinder 43 with respect to 42a is changed to 0 degree, 30 degrees, and 60 degrees. With this change, the flow rate ratio between the raw water guided to the first filtration unit 28 outside the bypass pipe 26 and the raw water guided to the second filtration unit 29 in the upper case 25 via the inside of the bypass pipe 26 is adjusted. It has become so. That is, the flow rate adjusting mechanism 27 controls the flow rate of the acidic water, and as a result, the elution amount of silver ions is adjusted.
[0026]
Next, the operation of the water quality adjusting type filter 11 of the first embodiment having the above-described configuration will be described.
When the water quality adjusting type filter 11 is used, raw water such as tap water flows through the inlet 15 of the lid 12 and fills the housing case 11a. In this state, when a water supply valve in a water supply pipe (not shown) connected to the outlet 16 is opened, the raw water in the storage case 11a causes the second filtration unit 29 to flow through the second filtration unit 29 in accordance with the flow rate adjustment ratio of the flow rate adjustment mechanism 27. The gas is introduced into the first filtration unit 28 outside the bypass pipe 26 through the first filtration unit 28. At the same time, the required amount of raw water passes through the inside of the bypass pipe 26 without passing through the first, second, and third filtration units 28, 29, and 32 according to the flow rate adjustment ratio of the flow rate adjustment mechanism 27. It is introduced into the fifth filtering section 38 in the upper case 25.
[0027]
Then, the raw water is filtered by the second filtration unit 29, and in the first filtration unit 28, the raw water is softened by the ion exchange resin 30, and the pH is adjusted to be a predetermined level of acidity. Subsequently, the acidic treated water softened in this way passes through the third filtration unit 32 and is sterilized by elution of silver ions. Further, silver ions are further eluted in the fourth filtration unit 35 with respect to the treated water that has passed through the third filtration unit 32.
[0028]
On the other hand, in the fifth filtration unit 38, raw water that is not softened and does not have a predetermined acid level is filtered. Therefore, silver ions hardly elute in this treated water. Thereafter, at the upper end in the cartridge 17, the treated water containing a large amount of silver ions and the treated water containing almost no silver ions are mixed. Then, the mixed water flows out through the outlet 18 and the outlet 16 into the water supply pipe.
[0029]
Accordingly, water having an appropriate hardness and having been subjected to bacteriostatic treatment can be supplied to the outside from the outlet 16 and used for ice making. Further, for example, when it is preferable to use hard water having a certain degree of hardness rather than completely soft water, such as when putting coffee or tea, etc., the flow rate of the treated water having a desired hardness is adjusted by adjusting the flow rate of the flow rate adjusting mechanism 27. Can be obtained. Also, when adjusting the strength of the bacteriostatic function, the flow rate of the flow rate adjusting mechanism 27 is adjusted. With this configuration, since all raw water does not pass through the first filtration unit 28 made of the ion exchange resin 30 and a part of the raw water is bypassed in the bypass pipe 26, the ion exchange of the first filtration unit 28 is performed. It is possible to suppress early deterioration of the resin 30 and the granular activated carbon 29a of the second filtration unit 29.
[0030]
Therefore, according to this embodiment, the following effects can be obtained.
In the water quality adjusting type filter 11 of this embodiment, the raw water is passed through the first filtration unit 28 filled with the filter medium made of the ion exchange resin 30 to partially soften the raw water. An H-type ion exchange resin 30 is used, and third and fourth filtration units 32 and 35 as silver ion eluting means are provided downstream of the first filtration unit 28.
[0031]
Therefore, according to this embodiment, when the raw water passes through the first filtration unit 28, the cations are removed by the filter medium made of the ion exchange resin 30, and the water is softened. In this case, the softened treated water is acidified because the ion exchange resin is H type. For this reason, silver ions are effectively eluted into the treated water from the third and fourth filtration units 32 and 35 as the silver ion elution means on the downstream side of the first filtration unit 28. Therefore, some of calcium and silica are dissolved in the acidic treated water, and thus it is difficult to scale. In addition, since silver ions have an effective bacteriostatic action, the growth of bacteria and bacteria can be suppressed. In addition, since the granular activated carbon 32a, 35a only needs to carry silver as the third and fourth filtration units 32, 35, the number of parts does not increase, and the manufacturing cost of the water quality adjustment type filter can be suppressed.
[0032]
According to this embodiment, a flow rate adjusting mechanism 27 for adjusting the elution amount of silver ions is provided.
Therefore, the amount of silver ions eluted can be controlled, the bacteriostatic function can be properly adjusted, and the life of the silver coating can be extended.
[0033]
(2nd Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, a water quality adjusting type filter 51 is provided in a raw water supply section to an ice maker 52.
[0034]
That is, a filtration unit 54 such as activated carbon for screening residual chlorine and impurities from raw water is connected to a part of the raw water supply pipe 53. A bypass circuit 55 is connected between the secondary side of the filtration unit 54 and the ice making machine 52, and the water quality adjustment type filter 51 is connected to the bypass circuit 55.
[0035]
The water quality adjusting type filter 51 includes a filtering section 56 made of the H-type ion exchange resin 30 on the upstream side similarly to the first embodiment, and a silver ion eluting unit on the downstream side of the filtering section 56. It has a filtering section 57 to constitute. The filtration unit 57 is filled with granular activated carbon 57a in which granular activated carbon is coated with silver or a silver alloy as in the above-described embodiment.
[0036]
A first valve 58 is connected to the raw water supply pipe 53 so as to be in parallel with the water quality control type filter 51, and a bypass circuit 55 is provided on the upstream side and the downstream side of the water quality control type filter 51, respectively. Are connected to the second and third valves 59 and 60.
[0037]
Accordingly, in a state where the first valve 58 is opened and the second and third valves 59 and 60 are closed, the raw water whose foreign substances are only filtered by the filtration unit 54 is sent to the ice making machine 52. In a state where the first valve 58 is closed and the second and third valves 59 and 60 are open, the raw water from which the foreign matter has been filtered by the filtration unit 54 is sent to the water quality control type filter 51. Then, while being softened by the filtration unit 56 of the water quality adjusting type filter 51, silver ions are eluted in the filtration unit 57 with respect to the treated water having a predetermined acidic level, and sent to the ice making machine 52.
[0038]
Therefore, in this embodiment, by selectively opening and closing the first to third valves 58 to 60, the raw water is acidified only when necessary, and silver ions are eluted in the raw water. The service life of the exchange resin 30 and the granular activated carbon 57a, that is, the service life can be extended.
[0039]
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG.
Also in the third embodiment, similarly to the second embodiment, a water quality adjusting type filter 51 provided with an H-type ion exchange resin is provided in a raw water supply section to an ice maker 52.
[0040]
That is, a pressurizing pump 71 is connected to a part of the raw water supply pipe 53, an ejector 72 is connected to a downstream side thereof, and the ice making machine 52 is further connected to a downstream side thereof.
[0041]
A raw water supply pipe 53 between the pressurizing pump 71 and the ejector 72 is connected to a water inlet side pipe 74 of the water quality adjusting type filter 51 via a pressure reducing valve 73. The water outlet side pipe 75 of the filtration unit 56 made of the H-type ion exchange resin of the water quality adjustment type filter 51 opposite to the water inlet side pipe 74 is connected to the suction port of the ejector 72. The water discharge side pipe 75 is provided with a filtering section 57, and the filtering section 57 is filled with granular activated carbon 57a obtained by coating granular activated carbon with silver or a silver alloy. The sampling cock 78 is for extracting sample water for pH check.
[0042]
Therefore, when the raw water pressurized by the pressurizing pump 71 passes through the ejector 72 at high speed, the suction water of the ejector 72 causes the acidic water whose pH has been adjusted by the water quality adjusting filter 51 to pass through the filtering section 57. Then, silver ions are eluted and sent to the ice making machine 52.
[0043]
Therefore, also in the third embodiment, the flow rate of the treated water passing through the filtration unit 57 can be adjusted by adjusting the pressure of the pressurizing pump 71, the opening of the pressure reducing valve 73, and the like.
[0044]
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. 7 for portions different from the third embodiment.
[0045]
In the fourth embodiment, a filtration unit 57 made of silver or silver alloy-coated granular activated carbon 57a is disposed downstream of the H-type ion exchange resin filtration unit 56 in the case of the water quality adjustment type filter 51. ing. The water discharge side pipe 75 is connected to the downstream side of the filtration unit 57.
[0046]
Therefore, in the fourth embodiment, since the filtration unit 57 made of silver or silver alloy-coated granular activated carbon 57a is disposed in the water quality adjustment type filter 51, the size of the entire system can be reduced.
[0047]
(Example of change)
This embodiment can be embodied with the following changes.
In the first embodiment, the third filtration unit 32 and the fourth filtration unit 35 are integrated. That is, the partition between the third filtration unit 32 and the fourth filtration unit 35 is removed.
[0048]
-In the first embodiment, the flow rate adjusting mechanism 27 is omitted.
In the first embodiment, the bypass pipe 26 and the fifth filter 38 are omitted.
[0049]
In the first and second embodiments, fibrous activated carbon or sheet-like activated carbon is used as the filter medium of the second filtration unit 29, the third filtration unit 32, the fourth filtration unit 35, and the fifth filtration unit 38 instead of the granular activated carbon. Use.
[0050]
(Another technical idea)
Further, technical ideas other than the claims grasped by the above embodiment will be described below together with their effects.
[0051]
(1) The water quality adjusting type filter according to any one of claims 1 to 3, wherein the bacteriostatic material is made of silver or a silver compound.
According to this configuration, it is possible to elute silver ions into the treated water and effectively control the treated water.
[0052]
(2) A plurality of filtration units having a bacteriostatic agent are provided, and a flow rate adjusting means for adjusting the flow rate of the raw water is connected to the filtration unit having a specific bacteriostatic agent without passing through the filtration unit of the ion exchange resin. The water quality control type filter according to any one of claims 1 to 3, wherein a filtration layer made of an ion exchange resin is connected to another filtration part having a bacteriostatic material.
[0053]
According to this configuration, the amount of raw water containing no silver ions can be freely adjusted.
(3) The water quality adjusting type filter according to any one of claims 1 to 3, wherein a cationic resin is used as the ion exchange resin.
[0054]
Therefore, the treated water that has passed through the ion exchange resin can be adjusted to an appropriate pH, and the hardness of the treated water can be effectively adjusted.
(4) An ice making circuit comprising the water quality adjusting type filter according to any one of claims 1 to 3, and the technical ideas (1) to (3).
[0055]
(5) An ice making machine provided with the water quality adjusting type filter according to any one of claims 1 to 3, and the technical ideas (1) to (3).
According to the ice making circuit and the ice making machine described in the technical ideas (4) and (5), the scale and the generation of bacteria and bacteria can be suppressed.
[0056]
【The invention's effect】
As described above in the embodiment, in the present invention, the softened treated water is acidified, calcium and silica are hardly scaled, and silver ions are effectively eluted, and bacteria and bacteria are dissolved. Has the effect of suppressing the breeding. In addition, in the present invention, silver may be supported on activated carbon or the like, for example, as silver ion eluting means. Therefore, the number of parts does not increase, and the manufacturing cost of the water quality adjusting type filter can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a water quality adjustment type filter equipped with a water quality adjustment type filter according to a first embodiment.
FIG. 2 is a sectional view taken along line 2-2 in FIG. 1;
FIG. 3 is an enlarged partial cross-sectional view showing a part of FIG. 1;
4 (a) to 4 (c) are cross-sectional views of main parts taken along line 4-4 in FIG. 3 showing the operation of the flow rate adjusting mechanism.
FIG. 5 is a water treatment circuit diagram showing a second embodiment.
FIG. 6 is a water treatment circuit diagram showing a third embodiment.
FIG. 7 is a water treatment circuit diagram showing a fourth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Water quality adjustment type filter, 11a ... Housing case, 12 ... Lid, 17 ... Cartridge, 19 ... Main body case, 25 ... Upper case, 26 ... Bypass pipe, 27 ... Flow control mechanism, 28 ... 1st filtration part, 29: a second filtration unit, 30: an ion exchange resin made of an ion exchange resin, 32: a third filtration unit as a silver ion elution means, 35 ... a fourth filtration unit as a silver ion elution means, 38 ... a fifth filtration unit Reference numeral 51 denotes a water quality adjusting filter; 52 denotes an ice machine; 54 denotes a filtration unit; 56 denotes a filtration unit; and 57 denotes a filtration unit as a silver ion elution means.

Claims (3)

Raw water is passed through a filtration section filled with a filter medium made of an ion exchange resin, and in a water quality adjustment type filter configured to soften the raw water,
Water quality control, wherein an H-type resin is used as the ion exchange resin, and silver ion elution means for eluting silver ions with respect to the acidic treated water is provided downstream of the filtration unit. Type filter. The water quality adjusting type filter according to claim 1, wherein the silver ion eluting means is activated carbon having a silver coating. The water quality adjusting type filter according to claim 1 or 2, further comprising an adjusting means for adjusting an elution amount of the silver ions.

Images