JP4195754B2 - Bath water purification device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for purifying bath water in a bathroom, and in particular, removes harmful substances such as chlorine and trihalomethane, and is safe and hygienic without the propagation of bacteria and the like in a bathtub, and is easy to install. The present invention relates to a bath water purifier that can be manufactured at low cost.
[0002]
[Prior art]
In recent years, the problems caused by chlorine injected into tap water for disinfection have been greatly raised. Chlorine has a number of important roles such as sterilizing pathogens, removing ammonia, iron, manganese, and organic substances, and clogging filtration devices with plankton and bacteria.
[0003]
However, on the other hand, chlorine combines with methane to produce what is called trihalomethane. This trihalomethane is a harmful substance that IARC (International Cancer Institute) has determined to be suspected to be carcinogenic. In addition, this trihalomethane has a property that it is easily dissolved in the fat of the human body, and there is a possibility that it will be reliably accumulated in the body even in a trace amount.
[0004]
For this reason, various purification apparatuses for drinking water have been developed. However, these problems caused by harmful substances such as chlorine and trihalomethane are not limited to drinking water.
[0005]
In other words, there are problems such as skin damage caused by harmful substances such as residual chlorine contained in bath water in the bathroom that directly contacts human skin, and problems that harmful substances are absorbed from the skin. There are also announcements that much more is absorbed by baths and showers (Science News 103 / Janet Larov).
[0006]
As described above, purification of chlorine and trihalomethane in bath water is a very important problem, but there are few purification devices developed mainly to remove harmful substances such as chlorine and trihalomethane. .
[0007]
Conventionally, as a bath water purification device in a domestic bathtub, the bath water in the bathtub is circulated by a circulation pump, and the bath water purification device such as a filtration device and the temperature of the bath water are set in the circulation line. There is a bath water circulation type purification device called a 24-hour bath that is provided with a heating device for maintaining the temperature.
[0008]
This purification device can take a clean bath 24 hours a day, so it is not necessary to clean the tub every time you take a bath, it is very convenient, and no special installation work is required. It was easy to install and attracted attention and spread rapidly.
[0009]
However, it became a big problem with the presentation at the Japanese Society for Environmental Infections that Legionella was detected at a high rate of 70% or more in the bathtub of a 24-hour bath for home use.
[0010]
Thereby, the sterilization function came to be provided in the purification apparatus. Various sterilization functions have already been developed,
1) Chlorine sterilization 2) Ozone sterilization 3) Ultraviolet sterilization 4) Heat sterilization
[0011]
As for chlorine sterilization of 1), general bacteria and E. coli can be sterilized, but Legionella bacteria require injection of a considerably high concentration of chlorine. Moreover, the problem of trihalomethane is not solved.
[0012]
Regarding the ozone sterilization of 2), the disinfection efficiency is unstable compared with chlorine, and it does not remain in water, so a continuous sterilization effect cannot be expected. It also has the effect of decomposing trihalomethane.
[0013]
3) With respect to ultraviolet sterilization, there is a problem of a decrease in output due to turbidity of the bathtub, etc., and sterilization is only the ultraviolet irradiation part, and there is no spread or continuity of the sterilization effect.
[0014]
4) About heat sterilization, although it can sterilize effectively also for Legionella bacteria etc. at 70 degreeC or more, normal bath water facilities are about 60 degreeC and require a special heating apparatus. Moreover, in actual bathing, if it is not cooled to about 45 ° C., there is a risk of burns and it cannot be used as it is.
[0015]
These 24-hour baths are designed to purify bacteria and viruses completely because dirt such as human body dirt and hair are mixed in the bathtub and purified while circulating dirty bath water. It is difficult to do.
[0016]
In other words, the bath water itself is purified, but the bath water in the bathtub is removed and cleaned, so that the bacteria are not completely removed, and the dirty bath water is constantly present. It is inevitable that a biofilm such as “slim” is formed on the inner wall of the pipe, and bacteria are propagated inside it.
[0017]
On the other hand, instead of a circulating purification device such as a 24-hour bath, several purification devices for removing harmful substances such as residual chlorine and trihalomethane in hot water supplied to a bathtub have been proposed. In this case, since the hot water in the bathtub is drained and cleaned after use, the problem of bacterial growth in the bathtub is eliminated.
[0018]
For example, Japanese Patent Application Laid-Open No. 10-18371 invents an apparatus in which a purification device is provided on the water supply side of a water heater for heating tap water. In Japanese Utility Model Laid-Open No. 6-40069, a shower head of a shower hose provided with a detachable purification material is devised.
[0019]
[Problems to be solved by the invention]
As described above, in the circulation type purification apparatus such as a 24-hour bath, there is a problem of bacterial propagation, and in order to solve this, special equipment such as high temperature sterilization is required, and the biofilm Therefore, it is necessary to clean regularly.
[0020]
Even if the bath water is changed every time, the bath is filled with the hot water and then used after being purified for a certain period of time until the purification is completed. The problem of bacterial propagation remains.
[0021]
In JP-A-10-108371, since the purification device is installed on the upstream side of the water heater, chlorine is removed before the tap water reaches the water heater. The problem of bacterial propagation in the side piping system remains. In addition, special construction for piping equipment is required.
[0022]
In addition, in the case of Japanese Utility Model Publication No. 6-40069, since the capacity of the purification material installed in the shower head is limited, the duration of purification capacity is short, and it is effective when used only for a shower. However, it is not suitable for hot water supply in the bathtub.
[0023]
In addition, there is no problem of bacterial growth if it is sprayed directly on the body, such as in a shower, but in the case of hot water supply to the bathtub, bacteria in the bathtub are taken into consideration for safety. It is necessary to take measures to prevent contamination.
[0024]
The present invention has been made in view of the above problems, and there is no problem of bacterial propagation in the purification apparatus or in the bathtub, and contamination of bacteria and harmful substances such as chlorine and trihalomethane into the bathtub. An object of the present invention is to provide a bath water purifying apparatus that can prevent water leakage, is safe and hygienic, can be manufactured at low cost, and can be easily installed.
[0025]
[Means for Solving the Problems]
In order to solve the above problems, the present invention does not circulate and purify bath water in the bathtub, but purifies harmful substances such as residual chlorine and trihalomethane present in the hot water supplied to the bathtub. It was purified by the device and supplied to the bathtub.
[0026]
This eliminates the problem of bacterial growth on the inner wall of the bathtub.
Further, the present bath hot water purification apparatus uses a double-structured container in which an inner container is installed in a main body container, and the inner container is a porous water-permeable container of 1 micron or less, The space between the inner container and the main body container is filled with a purification material.
[0027]
Porous ceramics can be used as the porous water-permeable container. Originally, since porcelain has a low strength, many of them are handled in the form of lumps or spheres, and they have been used as a medium for adsorptive purification materials and useful bacteria with purification ability.
In the present invention, this porous earthenware is formed into a cylindrical container shape, and the inside and outside thereof are filled with a purifying material, and the porous container wall is firmly protected by the filled purifying material. And The purification material used is a natural purification material.
[0028]
In the purification procedure, hot water from a water heater is supplied to the inner container, and harmful substances such as residual chlorine are adsorbed and removed by the purification material filled in the inner container. The purification material may be any purification material that can remove residual chlorine, trihalomethane, and the like. Moreover, in addition to the adsorbing action of harmful substances, coral sand or Ryukyu limestone having an effect of adjusting mineral components may be used, and ceramic materials having a far infrared effect may be used.
[0029]
Coral sand is a crushed sand coral that is sandy, is porous and has high adsorption performance, and contains a large amount of mineral components in seawater. It is mainly produced in Okinawa Prefecture and has been used for a long time as a purification material for rainwater storage tanks.
[0030]
Ryukyu limestone is also produced in Okinawa Prefecture and is a porous limestone that contains a lot of fossils such as coral. In Okinawa Prefecture, it has been used as a purification material for a long time in water tanks.
[0031]
For the inner container, a water permeable container of 1 micron or less is used. As a result, bacteria such as Escherichia coli and Legionella bacteria are several microns in size, so that these bacteria do not permeate through the walls of the permeable container from the inner container to the main body container side. In addition, bacteria mixed from the water supply piping system can be removed. As a water-permeable container of 1 micron or less, a container made of porous ceramics can be used.
[0032]
Porous earthenware is a material that is baked by mixing a base material with a material that burns or vaporizes during firing to produce innumerable pores. This has been developed for the purpose of reducing the weight of pottery, and it is an ideal lightweight pottery that mixes more mixed materials, increases the pore size of the porous material, and does not decrease the strength. Is being actively developed. In recent years, fire-resistant and high-strength hollow fine particles, fly ash balloons, and the like have been used as mixed materials.
[0033]
In the present invention, the above-mentioned porous ceramics are applied as a purification material. Conventionally, porous ceramics have been used as a purification material for sludge and drinking water. These were used as a breeding ground for useful microorganisms with a myriad of fine pores, and were used as a microorganism purification material, or purified as a spherical or granular form using a porous adsorption action. .
[0034]
In the present invention, the function as a porous filter having a pore diameter from which bacteria can be removed by a porous fine hole is used as a bowl-shaped ceramic container.
[0035]
Since it is porous, the strength is reduced, but there is no risk of damage to the inner container by using a double-structure container and filling the inner container and the space between the inner container and the main body container with the purifying material.
[0036]
The pore size of the porous material can be adjusted by adjusting the particle size of the mixed material to be mixed with the base material such as clay.
[0037]
In addition, since it is not necessary to consciously increase the strength of pottery, the firing temperature can be fired at a low temperature of about 800 ° C to 1200 ° C, and it is not necessary to apply an anti-drug for waterproofing, and it can be used in an unbaked state it can.
[0038]
As the mixed material, it is possible to use dry plant powder obtained by drying sawdust, straw, moon peach, straw, straw, etc., coral sand powder, Ryukyu limestone powder, and the like.
[0039]
By adjusting the particle size to a fine powder of about 1 micron, mixing it with a base material, shaping it into a bowl, and firing it, the pore diameter is baked to make a porous ceramic having a water permeability of 1 micron or less. .
[0040]
The mixing ratio of the mixed material to the base material varies depending on the mixed material, but is about 10 to 50%. If it is 10% or less, the pores after firing are not continuous and become single pores, so that the water permeability is lowered. If it is 50% or more, it becomes crispy and difficult to be shaped. Preferably, it is about 20 to 30%.
[0041]
Moreover, the main body container is provided with a discharge port for discharging the hot water after the purification treatment at the lower part of the main body container. If this main body container is made of a ceramic container, the hot water is activated by the far-infrared effect, and the bath water has a high thermal effect.
[0042]
DETAILED DESCRIPTION OF THE INVENTION
The bath water purifying apparatus of the present invention pays attention to the fact that people with sensitive skin such as atopy get into the bath and the symptoms worsen, and this removes residual chlorine etc. in the bath water. As a result of repeated research and trial manufacture, we found that it can be improved. As a result of the porous water permeable container and natural purification material, the bath water purification device is small and easy to install, and is effective for sensitive skin. The invention has been completed.
[0043]
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view showing an embodiment of a bath water purifying apparatus according to the present invention.
[0044]
In this bath water purifier, a lid body 2 is attached to the upper part of a cylindrical main body container 1, and a hot water supply port 3 is provided in the central part of the lid body 2. The hot water nozzle is connected to a hot water nozzle and a hose, and the hot water is supplied into the hot water purification apparatus. Further, the main body container 1 is made of ceramics, and a hot water discharge nozzle 4 is provided on the lower side surface, and is placed and fixed on a fixed base 5.
[0045]
2 is a vertical cross-sectional view of the bath water purifying apparatus according to the present invention, and FIG. 3 is a horizontal cross-sectional view taken along line AA of FIG.
[0046]
The bath purification apparatus is a double structure container, and an inner container 6 is provided inside the main body container 1. The inner container 6 is placed on an installation table 7 installed at the center of the bottom inside the main body container 1. A donut-shaped net plate 8 is attached to the outer periphery of the upper portion of the installation base 7.
[0047]
The inner purification zone 9 inside the inner vessel 6 is filled with coral sand, and the outer purification zone 10 in the space between the inner vessel 6 and the main vessel 1 is filled with Ryukyu limestone whose particle size is adjusted. Yes.
[0048]
The coral sand is a unique one produced in Okinawa Prefecture, and is obtained by crushing the skeleton of a coral carcass and adjusting the particle size so that the particle size is about 5 to 10 mm.
[0049]
The Ryukyu limestone is also produced only in Okinawa Prefecture and is a limestone containing a lot of fossil, and is very porous and contains a lot of minerals.
[0050]
The above-mentioned coral sand and Ryukyu limestone have been used in household septic tanks as a purifying material for purifying rainwater for a long time in the Okinawa Prefecture region, and have a mineral replenishment effect as well as a water purification effect.
[0051]
The inner container 6 is made of porous ceramics. This porous pottery is made by mixing or firing a material that generates innumerable pores by burning or vaporizing when the pottery is fired. The mixed material is pulverized into a fine powder of about 1 micron. By adjusting and baking, a porous ceramic having pores of 1 micron or less is obtained.
[0052]
Since the mixed material is finely pulverized to adjust the particle size, it can be easily mixed with clay, which is a pottery material, and can be produced in the same manner as in the production of ordinary clay. Since there is no need to apply an upper drug, there is no need for double baking, and the baking temperature may be a relatively low temperature of about 800 to 1200 ° C. For this reason, it can be sufficiently manufactured with a small electric furnace or the like.
[0053]
As the mixed material, dry plant powder such as persimmon, moon peach, persimmon, persimmon can be used. The rice cake is preferably rice straw or wheat straw. Moon peaches and persimmons use leaves and stems.棕櫚 uses skin and leaves. After these plants are sufficiently dried, they are pulverized to about 1 micron with a pulverizer to obtain a mixed material.
[0054]
Moon peaches have deodorant and antibacterial effects. In addition, salmon has a medicinal effect. In addition, drought is a filter medium that has been used in rainwater septic tanks for a long time in the Okinawa prefecture, and can be used for a long time without mold. Has antibacterial effect. In fact, the inventor's mother has lived for many years in a water purification tank using this cocoon, and has lived up to 101 years old without being healthy and wrinkled.
[0055]
Also, coral sand and Ryukyu limestone can be used as a mixed material after being pulverized to about 1 micron with a pulverizer. These have the effect of adjusting mineral components in addition to the adsorption effect.
[0056]
FIG. 4 is a schematic view showing an example of use of the bath water purifier according to the present invention. An installation plate 13 is stretched over the hot water nozzle 12 side of the bathtub 11 in the bathroom, and the hot water purification device 14 according to the present invention is placed on the installation plate 13.
[0057]
The hot water outlet 3 of the bath water purifier 14 and the hot water nozzle 12 of the bathtub 11 are connected by a hot water hose 15, and the hot water tap 16 of the hot water nozzle 12 is opened to bring hot water into the hot water purifier 14. Is supplied.
[0058]
The supplied hot water is first supplied to the upper part of the inner container 6 through the hot water supply port 3 as shown in FIG. Here, toxic substances such as chlorine and trihalomethane are adsorbed or decomposed by the coral sand filled in the inner purification zone 9 of the inner container 6.
[0059]
Further, by passing through the container wall of the inner container 6 made of porous ceramics, bacteria (such as Escherichia coli and Legionella) are removed and filled in the outer purification area 10 on the main body container 1 side. Flows into the packed bed of Ryukyu limestone.
[0060]
Here, minerals are dissolved in warm water by Ryukyu limestone. Even when the coral sand adsorption capacity in the inner purification zone 9 is reduced due to long-term use, the Ryukyu limestone adsorbs harmful substances such as chlorine and trihalomethane, which is safe.
[0061]
The hot water that has passed through the purification material in the outer purification zone 10 finally passes through the mesh plate 8 installed in the lower part of the Ryukyu limestone filling tank, and flows into the lower area 17 at the lower part of the main body container 1. 1 flows into the bathtub 11 through the hot water discharge nozzle 4 provided on the lower side surface of 1.
[0062]
The net plate 8 is provided so that the particles of Ryukyu limestone in the outer purification zone 10 do not flow into the bathtub 11 together with hot water, and is a mesh of finer mesh than the particles of Ryukyu limestone.
[0063]
In the present embodiment, the hot water discharge nozzle 4 is provided on the side surface. However, the hot water discharge nozzle 4 may be provided on the bottom surface of the main body container 1 so that a nozzle hole is formed in the installation plate 13 and flows into the bathtub 11 through that portion. . Moreover, about what has a fixed space in the edge part of the bathtub 11, without using the installation board 13, a bath water purification apparatus main body can be mounted directly, and can be used as it is.
[0064]
In addition, the fixing base 5 is preferably provided with a resin protrusion, a resin ring, or the like on the bottom surface thereof to perform an anti-slip treatment.
[0067]
This bath hot water purifying apparatus has its usage period set by the adsorption capacity of the purification material in the inner container and the filtration capacity of the inner container wall.
[0068]
In this example, the filling amount of the purification material (coral sand) in the inner purification zone 9 was 10 liters, and the filling amount of the purification material (Ryukyu limestone) in the outer purification zone 10 was 7 liters. The mixed material of porous earthenware used for the inner container 6 was a mixture of 20% dry rice straw powder adjusted to a particle size of 1 micron or less in earthen clay and fired at 1000 ° C.
[0069]
Moreover, the main body container 1 used the ceramics with the far-infrared effect baked at 1300 degreeC. Far-infrared is an electromagnetic wave having a wavelength of 2.5 to 100 microns, absorbed by water, improves water quality, suppresses the generation of general bacteria, improves the effect of preventing water decay and mild taste. Far-infrared ceramics and ceramics are commercially available as water purification materials.
[0070]
The bath water purification device 14 having the above-described configuration was installed in a bathroom, and 200 liters of purification was performed every day. No clogging occurred even after 6 months of use.
[0071]
The purification material in the internal purification zone 9 was filled with the same volume of activated carbon, which is often used as a purification material for drinking water, instead of coral sand. In this case, clogging occurred in about 3 months and it became impossible to use. The inner container 6 was taken out and the inside was examined. “Slimy” was generated on the surface of the activated carbon, and bacteria were generated using the activated carbon as a medium to give off a bad odor. Further, “slimming” was also found on the inner wall surface of the inner container 6, which caused clogging.
[0072]
On the other hand, when the purification material in the internal purification zone 9 is coral sand, “slimming” is not seen on the surface of the coral sand or the inner wall surface of the inner container 6 even after 6 months, and there is no bad odor. The occurrence of was not seen.
[0073]
I tried using Ryukyu limestone instead of coral sand in the inner purification zone 9. As with coral sand, after 6 months, there was no “slimming” and no odor.
[0074]
As the mixed material of the inner container 6 made of porous ceramics, dried fine powder of moon peach, strawberry and cocoon were used. In the case of moon peach, in addition to the antibacterial effect, the faint scent of moon peach moved to the bath, and the scent of moon peach was enjoyed in the bath. In the case of cocoons, the unique scent remains, and a medicinal herb effect can be expected. In the case of amber, there was no special scent. In any case, there were no problems such as “slimming” after 6 months of use.
[0075]
Furthermore, coral sand and fine powder of Ryukyu limestone were used as a mixed material for porous ceramics. Since these fine powders are porous inorganic materials, they are not vaporized and burned by firing, but are sintered in the same manner as clay, and are inherently porous and have water permeability. For this reason, there is little expansion | swelling by combustion etc. at the time of baking, and a porous becomes quite dense. There were no problems such as “slimming” after 6 months of use.
[0076]
Further, in the production of the porous ceramics of the present bath hot water purification apparatus 14, the porous ceramics discs, which are shaped and burned into a disc shape by using dry fine powder of rice straw as a mixed material, are horizontally arranged in three stages in the main body container. The septic tank was formed by alternately filling with the coral sand layer so as to form a layer of sapphire. It became clogged up in one month from the start of use and became unusable.
[0077]
This is because the porous disk is installed horizontally, so that fine powders such as coral sand crushed powder are deposited directly and block the fine holes of the porous disk.
[0078]
In addition, even if it is formed in multiple layers, the first porous disk is clogged first, so the pore diameter is gradually reduced from the top to the bottom for each layer, and finally 1 micron. Many kinds of porous discs must be manufactured. Moreover, when the surface area of a porous surface is compared, a porous disk is 20 times or less of the surface area of a container-shaped porous earthenware, and a process flow rate is too small.
[0079]
It is preferable to replace the purification material and the porous ceramic inner container of the present bath hot water purification device every six months. Although it can be used for 6 months or more, the treatment capacity gradually decreases due to the calcium content in the warm water.
[0080]
As described above, the present bath hot water purifier manufactures special porous ceramics, but can be manufactured in the same manner as a normal ceramics manufacturing process except that mixed powder is mixed into ceramic clay. In addition, since the natural purification material is used as the purification material, only the particle size adjustment is required and no special processing is required. For this reason, the purifying material and the inner container made of porous ceramics which are consumable parts can be manufactured at low cost. In addition, it exhibits a reliable purification capacity for a long period of 6 months.
[0081]
If the skin is sensitive and has symptoms such as atopy, pure water should be used instead of tap water for the first week. During this one week, by using the bath water purifying apparatus according to the present invention, a sufficient amount of minerals can be dissolved in pure water, and bath water that is very good for the skin can be provided. In recent years, pure water has come to be marketed relatively inexpensively, and effectively utilizes the elution capacity of pure water and the mineral action of the bath water purifier of the present invention.
[0082]
【The invention's effect】
The present invention described in detail above has the following effects.
1) It is small and does not require special equipment for installation, and can be installed in a bathroom and used easily, and can be manufactured at low cost.
[0083]
2) Since it has a double septic tank structure in which the inner container is installed in the main body container, it can be small and have a large purification area.
[0084]
3) Since it is a porous water-permeable container of 1 micron or less, bacteria can be removed and it is safe.
[0085]
4) The inner container made of porous earthenware is filled with a purifying material on the inner and outer sides of the container wall, so there is no fear of damage due to external impacts.
[0086]
5) Since there is no need to specially increase the strength of the pottery and the firing temperature can be lowered, there is no problem of expansion during firing, and no high temperature kiln is required, so that it can be manufactured at low cost.
[0087]
6) By using dry plant powders such as persimmon, moon peach, persimmon, persimmon as a mixed material for pore formation of porous ceramics, there are no generation of harmful substances during firing, and porous ceramics are manufactured at low cost it can. In addition, bath water has a unique and good fragrance, and the herbal effect is also demonstrated.
[0088]
7) By using coral sand and fine powder of Ryukyu limestone as a mixed material for pore formation of porous pottery, it can be manufactured in the same manufacturing process as normal pottery and can be manufactured at low cost. Further, there is no problem of thermal expansion, no deformation during firing, and dense pores are formed.
[0089]
8) Since coral sand and Ryukyu limestone are used as the purification material to be filled in the inner purification area and the outer purification area, harmful substances such as chlorine and trihalomethane can be removed. Moreover, since it has the effect of adjusting mineral components and is a natural purification material, it is safe.
[0090]
As described above, according to the present invention, there is no problem of bacterial propagation in the purification apparatus or in the bathtub, contamination of bacteria and harmful substances such as chlorine and trihalomethane into the bathtub can be prevented, and mineral-adjusted safety Therefore, it is possible to provide a bath water purifying device that can supply bath water that is gentle to the skin and that can be easily installed and manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an embodiment of a bath water purifying apparatus according to the present invention.
FIG. 2 is a longitudinal sectional view showing an embodiment of a bath water purifier according to the present invention.
FIG. 3 is a horizontal sectional view taken along line AA showing an embodiment of the bath water purifier according to the present invention.
FIG. 4 is a schematic perspective view showing an example of use of the bath water purifier according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body container 2 Cover body 3 Hot-water supply port 4 Discharge port 5 Fixed base 6 Inner container 7 Installation stand 8 Net plate 9 Inner purification area 10 Outer purification area 11 Bathtub 12 Hot-water supply nozzle (bathroom equipment)
13 Installation plate 14 Bath hot water purification device 15 Hot water supply hose 16 Hot water tap

Claims (8)

In the bath water purifying apparatus for purifying hot water and supplying it to the bathtub, the bath water purifying apparatus includes an inner container in the main body container, and includes an inner purification area in the inner container, an inner container and the main body container. The outer purification area of the space is filled with a purification material made of coral sand or Ryukyu limestone, and the inner container is made of porous earthenware, and burns or vaporizes when the earthenware is fired to generate countless pores. It is a porous pottery with pores of 1 micron or less obtained by mixing the material with a ceramic base material and baking it, adjusting the particle size to 1 micron or less and baking it. A bath water purifier having a double septic tank structure in which a hot water discharge port is provided in the main body container. 3. The bath water purifier according to claim 2 , wherein the porous earthenware is baked by mixing dry plant powder with a base material. The bath water purifier according to claim 2 , wherein the dried plant powder is dried cocoon powder. The bath water purification apparatus according to claim 2 , wherein the dried plant powder is dried moon peach powder. The bath water purifier according to claim 2 , wherein the dried plant powder is dried cocoon powder. The bath water purifier according to claim 2 , wherein the dried plant powder is dried cocoon powder. 2. The bath water purifier according to claim 1 , wherein the porous earthenware is baked by mixing coral sand powder with a base material. The porous pottery, bath water purifying apparatus according to claim according to claim 1, characterized by being fired by mixing powders of Ryukyu limestone matrix material.

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