JP2005169229A - Apparatus for purifying bath water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that when a method for removing a suspended particle by using a membrane is adopted, the backwashing efficiency of the membrane is bad. <P>SOLUTION: This apparatus for purifying bath water is provided with: a circulation pump 4 for circulating bath water 2; a filtering means 6 provided with a filter 5 for removing suspended matter in the bath water and; a flow passage switching valve for switching the outflow/inflow directions of the bath water to be sent to the filtering means when the bath water is purifyed or when the filter is washed. The surface of the filter is made water-repellent by using an emulsion composition so that the attachment of dirt (suspended matter) to the filter can be prevented, the dirt release effect can be improved and the filter backwashing efficiency can be improved. The surface of the filter is made water-repellent by using the emulsion composition so that a high-durability water-repellent coating film can be formed on the surface of the filter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a simple purification device that simply purifies bathtub water.

Suspended particles that become bath water stains include coarse particles such as hair and dust, particles such as stratum corneum peeled from the skin (particle size 20 μm to 100 μm), microparticles such as bacteria (particle size 1 μm or less), An apparatus for purifying and sterilizing bathtub water is known as providing bathtub water that can always be taken without replacing the bathtub water. In addition, on the premise that the bath water is replaced, as a simple purification that removes coarse particles such as hair and dust in the bath water, and particles such as the stratum corneum peeled off the skin, the bath water is circulated with a circulation pump, There is known a circulating bath water purification device that is purified by the method and then returned to the bathtub. As a purification | cleaning part, the method (for example, refer patent document 1) which removes suspended particles in bathtub water using a granular filter medium, the method which removes suspended particles using a hollow fiber membrane, a filter cloth, a porous filter, etc. Is formed into a pleated shape, a cylindrical shape, or a flat plate shape to remove suspended particles (see, for example, Patent Document 2).
JP-A-11-267414 Japanese Patent Laid-Open No. 11-9914

  However, in order to filter suspended particles having a particle diameter of 20 μm with a conventional bathtub water purification apparatus using a granular filter medium, it is necessary to use a granular filter medium with a small particle diameter and to increase the height of the filter medium filling, so that the filtration layer There was a problem that the pressure loss of the cleaning part increased and the size of the purification part increased. Moreover, when a granular filter medium was used, there existed a subject that a granular filter medium might leak at the time of washing | cleaning.

  The method using a hollow fiber membrane can remove suspended fine particles of 1 μm or less, but has a problem that washing is difficult and reverse washing efficiency is poor. In addition, a filter cloth or a porous filter formed in a pleated shape, a flat membrane shape or a cylindrical shape to remove suspended particles has a problem that backwashing efficiency is low as in the case of a hollow fiber membrane filter. However, the high-strength porous filter has a problem of high price.

  In order to solve the above-described conventional problems, the present invention provides a circulation pump for circulating bath water, a filtering means including a filter for removing suspended substances in bath water, and filtering during bath water purification and filter washing. The structure is equipped with a flow path switching valve that switches the inflow / outflow direction of bathtub water that passes through the means, and the surface of the filter is water-repellent with an emulsion composition to prevent the adhesion of dirt and the effect of removing dirt. Can increase the backwash efficiency. Moreover, a highly durable water-repellent film can also be obtained by repelling water with an emulsion composition.

  The bathtub water purification apparatus of the present invention can prevent the adhesion of dirt by increasing the water repellent treatment on the filter surface provided in the filtering means, and can enhance the effect of removing dirt and increase the backwash efficiency.

  The first invention includes a circulation pump that circulates bathtub water, a filtering means that includes a filter that removes suspended matter in the bathtub water, and bath water that passes through the filtering means when the bathtub water is purified and washed. It is equipped with a flow path switching valve that switches the inflow and outflow directions, and by applying a water repellent treatment to the filter surface provided in the filtering means, it is possible to prevent the adhesion of dirt and increase the effect of removing dirt and increase the backwash efficiency. . In addition, by forming the water-repellent layer by applying the emulsion composition, after coating, a film having excellent antifouling properties can be formed on the filter under low temperature heating or at room temperature for a short period of time. An aqueous layer can be obtained.

A second invention is an emulsion composition of the water-repellent layer, the acidulant having carboxylic acid of the general formula _{R1-Si (OR2) a X} b ( wherein, R1 is an amino group-containing group, R2 is 1 carbon atoms -4 alkyl group, X is an alkyl group having 1 to 4 carbon atoms, and a and b are numbers satisfying the relationship of 1 ≦ a ≦ 3 and a + b = 3), respectively. 100 parts by weight of the carboxylic acid / amino base-containing compound obtained in the above, 1000 to 6000 parts by weight of an emulsion of alkyl-modified silicone oil whose year at 25 ° C. is 20 to 50000 cp, and 1000 to 30000 parts by weight of water. Thus, after coating, a film excellent in antifouling property can be formed on the substrate under short-time heating or at room temperature.

  According to a third aspect of the present invention, a film is formed on the surface by a film-forming component obtained by adding at least one mixture selected from the group of organic fluorine compounds to the emulsion composition of the water-repellent layer. Is strongly coated and exhibits good water repellency.

  According to a fourth aspect of the present invention, there is provided a film comprising a film-forming component obtained by adding at least one mixture selected from the group of perfluoroalkylsilane compounds to a water-repellent layer emulsion composition. The silane compound is chemically strongly bonded to the active group on the filter substrate, and the water repellent effect can be maintained for a long time.

  5th invention is the structure which reversely wash | cleans the inside of a filter by switching the outflow / inflow direction of the water which flows into a filtration means, after carrying out the surface washing which peels the suspended substance deposited on the filter surface by a swirl flow at the time of filter washing | cleaning By doing so, the backwashing efficiency of the filter can be further increased.

  According to the sixth aspect of the invention, the backwashing efficiency of the filter can be further improved by providing a bubble mixing part on the downstream side of the filtering means and backwashing the inside of the filter with bubbles mixed by the bubble mixing part at the time of filter cleaning.

  According to the seventh aspect of the invention, in particular, the bubble mixing portion of the seventh aspect is configured by an ejector, so that air can be mixed by the flow of water, and the inside of the filter is back-washed by the mixed bubbles, The backwash efficiency can be further increased.

  In the eighth invention, the pore diameter of the filter provided in the filtering means is set to 20 to 30 μm, whereby particles such as a stratum corneum peeled from the skin (particle diameter 20 μm to 100 μm) can be efficiently removed.

  According to the ninth aspect of the present invention, a filter with good durability can be obtained by forming the filter as a non-woven cloth laminated and sintered in a metal fiber woven or felt shape.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

  In addition, the content of the code | symbol (A), (B), and (C) in the following examples is as follows.

The acidulant with water-repellent layer is a (A) a carboxylic acid of the general formula _{R1-Si (OR2) a X} b ( wherein, R1 is an amino group-containing group, R2 is an alkyl group having 1 to 4 carbon atoms, X is A carboxylic acid / amino base obtained by reacting an amino group-containing silane represented by the following formula: an alkyl group having 1 to 4 carbon atoms, a and b each satisfying the relations 1 ≦ a ≦ 3 and a + b = 3) It is an emulsion composition containing 100 parts by weight of the containing compound, (B) 1000 to 6000 parts by weight of an emulsion of an alkyl-modified silicone oil having a viscosity of 20 to 50000 cp at 25 ° C., and (C) 1000 to 30000 parts by weight of water.

(Embodiment 1)
FIG. 1 is a configuration diagram of a bathtub water purification device according to a first embodiment of the present invention. In FIG. 1, a circulation flow path 3 and a circulation pump 4 that circulate the bathtub water 2 of the bathtub 1 are a purifier 6 provided with a filter 5 therein, and a first switching valve provided upstream and downstream of the purifier 6. 7 and the second switching valve 8 are connected. The first switching valve 7 is connected to the drainage flow path 9, and the second switching valve 8 is connected to the hot water supply heat source 10 through a pipe 11. The circulation channel 3 is connected to the bathtub 1 by an adapter 12, and the adapter 12 has a discharge part 13 and a suction part 14.

  The purifying means 6 includes a cylindrical can body having a filter 5 in which a stainless woven filter 15 having an aperture diameter of 27 μm and a reinforcing plate 16 are sintered and formed, and a pipe 17 connected to the first switching valve 7 and The pipe 18 connected to the second switching valve 8 is connected to a cylindrical can body.

A water repellent layer is formed on the surface of the filter 5. As a method for forming the water repellent layer, 100 g of water and 21.0 g (0.1 mol) of citric acid monohydrate are dissolved in a flask equipped with a stirrer, a heating jacket, a reflux condenser and a dropping funnel. In addition, although citric acid was used as an acidulant having a carboxylic acid, gluconic acid, succinic acid, lactic acid, fumaric acid, DL-malic acid, etc. are also exemplified, and among these, a stable film should be formed. Citric acid and DL-malic acid are preferred because of their ease of synthesis. At this time, the acid side is confirmed by pH test paper. Then, γ- (N- (β-aminoethyl) amino) aminopropylmethyldimethoxysilane; 23.4 g (0.1 mol) was added from the dropping funnel, and the mixture was stirred at a liquid temperature of 50 to 60 ° C. for 1 hour. . In this example, γ- (N- (β-aminoethyl) amino) aminopropylmethyldimethoxysilane was used, but in addition, an amino group represented by the general formula R1-Si (OR2) _{a Xb} Containing silanes can be used. R1 is an amino group-containing group, and examples thereof include those represented by (Chemical Formula 1), wherein R6 and R7 are divalent hydrocarbon groups having 1 to 6 carbon atoms, and R8 is a hydrogen atom or having 1 to 6 carbon atoms. A monovalent hydrocarbon group, r represents an integer of 0 to 3.

具体例としてアミノ基含有基として、アミノメチル基、β−アミノエチル基、γ−アミノプロピル基、δ−アミノブチル基、Ｎ−（β−アミノエチル）アミノメチル基、γ−（Ｎ−（β−アミノエチル）アミノ）アミノプロピル基などを用いても同様の効果が得られる。その後３０℃まで冷却を行い、水溶液のpHがニュートラルであることを確認し、カルボン酸・アミン塩基含有化合物を得た。

Specific examples of the amino group-containing group include aminomethyl group, β-aminoethyl group, γ-aminopropyl group, δ-aminobutyl group, N- (β-aminoethyl) aminomethyl group, γ- (N- (β The same effect can be obtained by using -aminoethyl) amino) aminopropyl group or the like. Thereafter, the mixture was cooled to 30 ° C. to confirm that the pH of the aqueous solution was neutral, and a carboxylic acid / amine base-containing compound was obtained.

  The viscosity of the alkyl-modified silicone oil used at 25 ° C. is preferably 20 to 50000 cp, particularly preferably 100 to 500 cp. When the viscosity of the alkyl-modified silicone oil in the component (B) is 20 cp or less, volatile components are mixed, which causes less components to be incorporated into the film and causes a low flash point, which is not preferable. Moreover, when apply | coated, since remarkable movement to a gravitational direction is performed and the shielding property falls, it is unpreferable. On the other hand, if the viscosity exceeds 50000 cp, problems such as stickiness and smoothness on the surface occur, which is not preferable.

  The alkyl-modified silicone oil used is obtained by adding a hydrocarbon having at least one double bond to polydimethylhydrogensiloxane or polymethylhydrogendimethylsiloxane copolymer. These can be synthesized by adding an α-olefin by addition reaction to polymethylhydrogensiloxane or polymethylhydrogendimethylsilicone copolymer using a platinum catalyst.

  The amount of component (B) is preferably 1000 to 6000 parts by weight, particularly preferably 500 to 2000 parts by weight, per 100 parts by weight of component (A). If the amount is less than 1000 parts by weight, the durability of the coating film will be unfavorable, and if it exceeds 6000 parts by weight, the compatibility with the film-forming component will be unsatisfactory and the coating film will be clouded and a clear surface will not be formed.

  The component (C) water is used in an amount of 1000 to 30000 parts by weight per 100 parts by weight of the carboxylic acid / amino base-containing compound (A). If the amount is less than 1000 parts by weight, problems such as stickiness are caused, and if it exceeds 30000 parts by weight, the coating-forming component content is small and the water repellency is partially inferior, resulting in variations.

  The emulsion composition of the present invention comprises the aforementioned component (A), component (B) and component (C), and various additives may be added as necessary. The blending amount is not particularly limited as long as the object of the present invention is not impaired. Examples of the additive include film modifiers such as higher fatty acid esters, ultraviolet absorbers, thickeners and antioxidants. As a method of applying the emulsion composition to the filter 5, a commonly used method such as spray coating, brush coating, puff coating, or dipping method can be used. After coating, it was dried for 48 hours in an environment of 25 ° C.

  The emulsion composition of the present invention does not need to be heated particularly during curing. If the emulsion composition is allowed to stand at room temperature for about 0.5 to 48 hours after coating, a film having no surface tackiness can be easily obtained. It can be heated to shorten the curing time.

  With the above configuration, during the purification operation, the bath water 2 is circulated by the circulation pump 4 through the suction portion 14, the circulation flow path 3, and the first switching valve 7, and is supplied to the purification means 6 through the pipe 17. The bathtub water 2 supplied to the purification means 6 is trapped on the filter 5 through the filter 5, and the suspended water is removed and purified from the pipe 17 and the second water. Is circulated from the discharge section 13 to the bathtub 1 through the switching valve 8.

  At the time of cleaning the filter 5, the first switching valve 7 and the second switching valve 8 are switched to reverse the flow of water flowing through the purifying means 6 and clean the filter. Wash water from the hot water supply heat source 10 is supplied to the purification means 5 through the pipe 11 and the second switching valve 8 through the pipe 18. Suspended particles captured by the filter 5 are removed by the water flow, and the wash water is drained through the first switching valve 7 and the drainage flow path 9. By forming a water-repellent layer on the surface of the filter 5, it is possible to prevent adhesion of dirt, to enhance the peeling effect during cleaning, and to improve backwashing efficiency.

  In particular, by applying and forming an emulsion composition, a coating with excellent antifouling properties can be formed on the filter under low-temperature heating or at room temperature for a short time after application to obtain a water-repellent layer with high antifouling performance. Can do.

  The pore size of the filter 5 is related to the particle size of suspended solids in the bath water after bathing. By removing suspended particles of 20μ or more, the bath water after bathing feels clean (turbidity). As a result, it has been experimentally confirmed to reach 0.8). When the aperture diameter of the filter 5 is 20 μm or less, the clogging of the filter is unnecessarily accelerated, the pressure loss of the filter is increased, and the cleaning efficiency is deteriorated. In addition, if the pore size of the filter 5 is 40 μm or more, suspended particles in the bath water cannot be completely removed, and the level at which a person feels the bath water after bathing is clean (turbidity is 0.8). It has also been experimentally confirmed that it cannot be purified by By setting the pore diameter of the filter 5 provided in the filtering means 6 to 20 to 40 μm, particles such as a stratum corneum peeled from the skin (particle diameter 20 μm to 100 μm) can be efficiently removed.

  Moreover, a filter with good durability can be obtained by making the filter into a non-woven cloth that is laminated and sintered in the form of a metal fiber fabric or felt.

(Embodiment 2)
Next, a water repellent layer forming method according to Embodiment 2 of the present invention will be described. In a flask equipped with a stirrer, a heating jacket, a reflux condenser and a dropping funnel, 100 g of water and 21.0 g (0.1 mol) of citric acid monohydrate are dissolved. At this time, the acid side is confirmed by pH test paper. Then, γ- (N- (β-aminoethyl) amino) aminopropyltrimethoxysilane; 25.9 g (0.1 mol) was added from the dropping funnel, and the mixture was stirred at a liquid temperature of 50 to 60 ° C. for 1 hour. . Thereafter, the mixture was cooled to 30 ° C. to confirm that the pH of the aqueous solution was neutral, and a carboxylic acid / amine base-containing compound was obtained.

  Next, adjustment examples are shown. To a flask equipped with a stirrer, a heating jacket, a reflux condenser and a dropping funnel, 92 g of alkyl-modified silicone oil (2) with a viscosity of 1000 cp, NIKKOL OP-5 (Nippon Oils and Fats Emulsifier); 3.3 g, NIKKOL18TX (Nippon Oils and Fats) Emulsifier); 3.3 g, boukinin P; 0.1 g, boukinin M; 0.2 g are charged and stirred and mixed at 50 to 55 ° C. Thereto, 20 g of water was added. The above mixture was subjected to mill inversion at a mill pressure of 40 mil pressure, and the inverted product was dispersed in water so that dimethyl silicone oil was 30% to obtain an emulsion.

Next, comparative adjustment examples are shown. A flask equipped with a stirrer, a heating jacket, a reflux condenser and a dropping funnel is charged with 402 g of octamethylcyclotetrasiloxane, hexamethyldisiloxane; 2.6 g dodecylbenzenesulfonic acid; 7.5 g and mixed with stirring. Thereto, 907 g of water was added, and rough emulsification was performed. The crude emulsion was emulsified with a pressure homogenizer (primary pressure 50 kg / cm 2: secondary pressure 400 kg / cm 2). Subsequently, the emulsion was subjected to emulsion polymerization at 80 to 90 ° C., CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ Si (OCH ₃ ) ₃ ; 20 g was mixed, dimethyl silicone oil viscosity 30000 cp, component concentration 32%. An emulsion was obtained. The test body was prepared by preparing a commercially available toilet bowl, degreased and washed with ethanol, and spray-coated each coating composition so that the coating amount was 15 g.

In addition, in addition to CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ Si (OCH ₃ ) ₃ mixed in order to improve water repellency in this example, it is selected from the group of organic fluorine compounds and perfluoroalkylsilane compounds. The same effect can be obtained by using at least one kind.

  Specific examples of the organic fluorine compound include polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, Chlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene / hexafluoropropylene / perfluoroalkyl vinyl fluoride, vinylidene fluoride / tetrafluoroethylene copolymer, polyvinyl fluoride, vinyl fluoride / tetrafluoroethylene copolymer, Vinylidene fluoride / tetrafluoroethylene / hexafluoropropylene copolymer, vinylidene fluoride / hexafluoropropylene copolymer, perfluoropolyether , Perfluoroalkyl polyethers, and fluorinated oils such as ethylene trifluoride copolymer, but such a fluorine-based surface active agents, not limited thereto.

As the perfluoroalkylsilane compound, some of the alkyl groups of the alkylsilane compound are substituted with fluorocarbon groups. For example, CF ₃ (CH ₂ ) ₂ Si (OCH ₃ ) ₃ , CF ₃ ( CF ₂ ) ₅ (CH ₂ ) ₂ Si (OCH ₃ ) ₃ , CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ Si (OCH ₃ ) ₃ , CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ SiCH ₃ ( Silane compounds having 1 to 20 carbon atoms, such as OCH ₃ ) ₂ , CF ₃ (CF ₂ ) ₃ (CH ₂ ) ₂ Si (OCH ₃ ) ₃ , CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ SiCl _3, etc. Although it is mentioned, it is not limited to these.

(Embodiment 3)
FIG. 2 is a configuration diagram of a bathtub water purification apparatus according to the third embodiment of the present invention. In FIG. 2, the same reference numerals as those in the first embodiment have the same configuration and perform the same operation, and the description thereof is omitted.

  The purifying means 7 has a cylindrical can body having a filter 5 in which a stainless woven filter 15 having an opening diameter of 27 μm and a reinforcing plate 16 and a sintered molding are formed inside, and the first switching valve 7 and the upstream side of the filter 5 A connected piping 17, a cleaning piping 20 connected to the drain valve 19, and a piping 18 connected to the second switching valve 8 are connected to the downstream side of the filter 5. The drain valve 19 is connected to the drain channel 9, and the wash water that has cleaned the surface of the filter 5 is drained from the drain channel 9. In addition, a bubble mixing part 21 is connected to the pipe 18. The bubble mixing part 21 is composed of an ejector and can mix air by the flow of water.

  With the above configuration, during the purification operation, the drain valve 19 is closed, and suspended substances in the bath water are captured on the surface of the filter 5 by the same operation as in the first embodiment.

  When cleaning the filter 5, first, the drain valve 19 is opened, and the cleaning water from the hot water supply heat source 10 is supplied to the purification means 6 through the pipe 17. The cleaning water cleans the surface of the filter 5 and is drained from the drainage channel 9 through the drain valve 19. Next, by switching the first switching valve 7 and the second switching valve 8, the flow of water passing through the purification means 6 is reversed, and the bubble mixing part 21 is connected via the pipe 11 and the second switching valve 8. The cleaning water mixed with bubbles is supplied to the purification means 5 through the pipe 18. Suspended particles trapped in the filter 5 by the water flow and bubbles are removed, and the wash water is drained through the first switching valve 7 and the drainage flow path 9.

  In this way, after washing the surface to remove the suspended matter accumulated on the filter surface, the flow of water passing through the filtration means is switched, and the inside of the filter is backwashed so that the filter is backwashed. Efficiency can be increased.

  Moreover, the backwashing efficiency of a filter can be improved by providing a bubble mixing part in the downstream of a filtration means, and backwashing the inside of a filter with the bubble mixed by the bubble mixing part at the time of washing | cleaning.

  As described above, since the bathtub water purification apparatus according to the present invention can be purified in a small size and at a low price, it can be applied to uses such as purification of an appreciation fish tank and purification of rainwater.

The block diagram of the bathtub water purification apparatus in Embodiment 1 of this invention The block diagram of the bathtub water purification apparatus in Embodiment 3 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bathtub 2 Bath water 3 Circulation flow path 4 Circulation pump 5 Filter 6 Purification means 6
7 First switching valve 8 Second switching valve 9 Drain flow path 10 Hot water supply heat source 12 Adapter 13 Discharge section 14 Suction section 15 Stainless steel woven filter 16 Reinforcement plate 21 Bubble mixing section

Claims (9)

A circulation pump that circulates the bath water, a filtering means having a filter for removing suspended substances in the bath water, and switching the inflow / outflow direction of the bath water that passes through the filtering means during the bath water purification and filter cleaning A bath water purification apparatus comprising a flow path switching valve and having a water-repellent layer formed by applying an emulsion composition on the surface of the filter. Hydrophobic layer, the acidulant having carboxylic acid of the general formula _{R1-Si (OR2) a X} b ( where, wherein R1 is an amino group-containing group, R2 is an alkyl group having 1 to 4 carbon atoms, X is carbon 1 to 4 alkyl groups, a and b each satisfying the relations 1 ≦ a ≦ 3 and a + b = 3) containing a carboxylic acid / amino base obtained by reacting with an amino group-containing silane 2. Bath water purification according to claim 1, which is an emulsion composition comprising 100 parts by weight of a compound, 1000-6000 parts by weight of an emulsion of alkyl-modified silicone oil having a viscosity of 20-50000 cp at 25 ° C. and 1000-30000 parts by weight of water. apparatus. 3. The bath water according to claim 1, wherein the water repellent layer is formed on the surface with a film formed of a film forming component obtained by adding at least one mixture selected from the group of organic fluorine compounds to the emulsion composition. Purification equipment. 3. The water repellent layer is formed on the surface with a film formed by a film forming component obtained by adding at least one mixture selected from the group of perfluoroalkylsilane compounds to the emulsion composition. Bathtub water purification device. 5. The filter according to claim 1, wherein at the time of filter cleaning, after the surface of the suspended matter deposited on the filter surface is peeled off by a swirling flow, the direction of water flowing into the filtering means is switched to reversely clean the inside of the filter. The bathtub water purification apparatus of any one of Claims. A bubble mixing part is provided on the downstream side of the filtering means, and the direction of water flowing into the filtering means is switched to reversely clean the inside of the filter. During filter cleaning, the inside of the filter is backwashed with bubbles mixed by the bubble mixing part. The bathtub water purification apparatus of any one of Claims 1-5. The bathtub water purification device according to claim 6, wherein the bubble mixing part is constituted by an ejector, and air is mixed by a flow of water. The bathtub water purifier according to any one of claims 1 to 7, wherein the filter provided in the filtering means has an aperture diameter of 20 to 40 µm. The bathtub water washing apparatus according to any one of claims 1 to 8, wherein the filter is a non-woven cloth laminated and sintered in a metal fiber fabric or felt shape.

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