Water purification material, water purification cartridge, water purifier, method for producing water purification material, and water purification method

Abstract

To provide a water purifying material realizing a sufficient treatment flow rate in water purification using the water purifying material and capable of sufficiently developing functionality necessary as the water purifying material such as the removal of impurities or heavy metals from water to be purified, the impartation of minerals to water or the suppression of the putrefaction of treated water.SOLUTION: The water purifying material is obtained by mixing a first coral material which is coral particles having a particle size of 0. 71mm to 2. 0mm, a second coral material obtained by attaching silver to the surfaces of coral particles having a particle size of 0. 71mm to 2. 0mm and a third coral material obtained by firing coral particles having a particle size of 0. 18mm to 0. 71mm at about 600 °C at a prescribed wt.%.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a water purification material, a water purification cartridge, a water purifier, a method for manufacturing a water purification material, and a water purification method. More specifically, the present invention relates to a water purification material that achieves a sufficient treatment flow rate and fully exhibits the functionality required for a water purification material, such as removing impurities and heavy metals from the purified water or adding minerals to the water. [Background technology]

[0002] In water purifiers, activated carbon has long been used as a water purification material to adsorb impurities from the water being treated, coral stone or the like is used to add minerals to the water being treated, or silver is impregnated into the water purification material to prevent the growth of bacteria in the treated water and suppress putrefaction (see Patent Documents 1 and 2).

[0003] For home use, for example, such water purification materials are often used in the form of granular or powdered materials packed into a water-permeable cartridge case to form a water purification cartridge. However, such water purification cartridges have the problem that the water purification materials filled inside tend to stick together due to the pressure of the water being treated and wear when rubbing against each other, which gradually reduces the water flow and reduces the water purification ability.

[0004] To solve this problem, water purification materials have been proposed, such as that disclosed in Patent Document 3. The conventional water purification material described in Patent Document 3 has a water-repellent material dispersed and mixed into the filter material, and by utilizing the water-repellent properties of the water-repellent material, it is possible to achieve a high filtration flow rate from the initial stage of water flow. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-38894

[0006] [Patent Document 2] Japanese Unexamined Patent Publication No. 56-63909

[0007] [Patent Document 3] JP 2014-121691 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, conventional water purification materials have water-repellent materials dispersed and mixed into the filter material. Even if the water-repellent material is contained in a specified proportion, unlike the water-repellent effect that occurs in the atmosphere, in water where a certain water pressure is continuously applied, it cannot be expected to have an effect of smoothing the flow of water, and in practice, its effect is not sufficient.

[0009] Naturally, if the total amount of water purification material is the same, the amount of filtering material will be reduced relatively due to the addition of a water repellent material. In other words, even if the flow of water through the filtering material is smoothed and the treatment flow rate can be increased somewhat, the functionality required for the filtering material, such as removing impurities and heavy metals from the purified water, adding minerals to the water, and preventing putrefaction of the treated water, will be reduced by the amount of filtering material reduced.

[0010] The present invention has been devised in light of the above points, and aims to provide a water purification material, water purification cartridge, water purifier, method for manufacturing a water purification material, and water purification method that can achieve a sufficient treatment flow rate when purifying water using the water purification material, and can fully demonstrate the functionality required of a water purification material, such as removing impurities and heavy metals from the purified water, adding minerals to the water, and preventing putrefaction of the treated water. [Means for solving the problem]

[0011] [1] In order to achieve the above object, the present invention provides a water purification material that is a mixture of a first coral raw material, which is coral particles having a particle size of 0.71 mm or more and less than 2.0 mm, a second coral raw material in which silver is attached to the surface of coral particles having a particle size of 0.71 mm or more and less than 2.0 mm, and a third coral raw material in which coral particles having a particle size of 0.18 mm or more and less than 0.71 mm are fired at approximately 600°C, in a predetermined weight percentage.

[0012] According to the water purification material of the present invention, the first coral raw material and the second coral raw material are formed from coral particles with relatively large particle sizes in the range of 0.71 mm or more and less than 2.0 mm, and the third coral raw material is formed from coral particles with relatively small particle sizes in the range of 0.18 mm or more and less than 0.71 mm.

[0013] In addition, the coral particles used in the water purification material as a whole are within the particle size range of 0.18mm to 2.0mm, which means that small coral particles less than 0.18mm and large coral particles over 2.0mm are excluded.

[0014] This prevents small coral particles from being included in the water purification material and from filling the gaps between larger particles, preventing clogging caused by small coral particles and impeding water permeability.

[0015] In addition, since the water purification material does not contain large coral particles, it is possible to prevent the large coral particles from being concentrated in one area of ​​the material, which would result in larger gaps between the particles and an unexpected increase in water permeability, making it impossible to maintain functionality.This means that the functionality of purifying water and adding minerals can be stably maintained.

[0016] The water to be purified is treated using a predetermined water pressure, such as the pressure of a water supply. Even when the water is flowing relatively fast, the water can flow while being in contact with the entire surface of the particles of the water purification material. This allows the water purification process to be carried out while exhibiting the necessary functionality as a water purification material, such as adding minerals using coral particles, removing heavy metals, or generating silver ions by attaching silver to the coral particles, thereby preventing the growth of bacteria in the treated water and suppressing decay.

[0017] [2] The water purification material of the present invention may be configured such that the first coral raw material is 60 to 80% by weight, the second coral raw material is 10 to 30% by weight, and the third coral raw material is 5 to 15% by weight.

[0018] In this case, a good balance between water permeability and functionality that meets the standard for home use can be achieved.

[0019] In addition, since there is a certain degree of freedom in the composition of the coral raw materials, water purification materials can be created with compositions that are appropriately adapted to various conditions in water purification treatment, such as the flow rate of the water to be purified, the size of the cartridge or water purifier, or processing capacity.

[0020] [3] The water purification material of the present invention may be configured so that the first coral raw material is 72% by weight, the second coral raw material is 18% by weight, and the third coral raw material is 10% by weight.

[0021] In this case, a good balance between water permeability and functionality that is standard for home use can be further achieved. In other words, based on the findings of the inventor, by balancing the blending of large particle size (0.71 mm or more and less than 2.0 mm) coral raw materials with small particle size (0.18 mm or more and less than 0.71 mm) coral raw materials at a weight ratio of approximately 9:1, it is possible to achieve an even better balance between water permeability and functionality, as described above.

[0022] [4] In order to achieve the above object, the present invention provides a water purification cartridge comprising: a cartridge case; and a water purification processing section disposed within the cartridge case, in the direction of purifying water, with an activated carbon layer as a first layer and a coral layer as a second layer, the coral layer being filled with a mixture of 60 to 80% by weight of a first coral material which is coral particles having a particle size of 0.71 mm or more and less than 2.0 mm, 10 to 30% by weight of a second coral material which is coral particles having a particle size of 0.71 mm or more and less than 2.0 mm with silver attached to the surface, and 5 to 15% by weight of a third coral material which is coral particles having a particle size of 0.18 mm or more and less than 0.71 mm and fired at approximately 600°C.

[0023] According to the water purification cartridge of the present invention, the water purification material made of each coral raw material with the particle size described in [1] above is filled into the cartridge case. Therefore, when used as a water purification cartridge for a water purifier, even when the water is treated under conditions where the water flows relatively fast, the water can flow while coming into contact with the entire surface of the particles of the water purification material.

[0024] This allows the water purification process to be carried out by exhibiting the necessary functions as a water purification material, such as adding minerals through coral particles, removing heavy metals, or preventing the growth of bacteria in the treated water and suppressing putrefaction through the generation of silver ions by attaching silver to the coral particles.

[0025] [5] In order to achieve the above object, the present invention provides a water purifier comprising: a housing; a cartridge case accommodated in the housing; and a water purification cartridge having a water purification processing section that is filled with a mixture of: a first layer of activated carbon and a second layer of coral in the direction of purifying water; the coral layer containing 60 to 80% by weight of a first coral material, which is coral particles having a particle size of 0.71 mm or more and less than 2.0 mm; 10 to 30% by weight of a second coral material, which is coral particles having a particle size of 0.71 mm or more and less than 2.0 mm with silver applied to the surface; and 5 to 15% by weight of a third coral material, which is coral particles having a particle size of 0.18 mm or more and less than 0.71 mm and baked at approximately 600°C.

[0026] According to the water purifier of the present invention, the water purification cartridge is filled with water purification material made of coral raw materials with the particle sizes described in [1] above in a cartridge case, so that even when the water is treated under conditions where the water flows relatively fast, the water can flow while coming into contact with the entire surface of the particles of the water purification material.

[0027] This allows the water purification process to be carried out by exhibiting the necessary functions as a water purification material, such as adding minerals through coral particles, removing heavy metals, or preventing the growth of bacteria in the treated water and suppressing putrefaction through the generation of silver ions by attaching silver to the coral particles.

[0028] [6] The water purifier of the present invention may be configured such that the water-conducting portion of the water purification cartridge is provided on the outer peripheral side of the water purification cartridge, the water-collecting portion of the water purification cartridge is provided in the center, and the water-collecting portion is connected to the water outlet portion of the housing.

[0029] In this case, the water-conducting section of the water purifier cartridge is located on the outer periphery of the cartridge, and the water-collecting section is located in the center, so that the water to be purified enters the cartridge from the water-conducting section on the outer periphery, is treated by the water-purifying material, and is collected in the water-collecting section in the center. The purified water in the water-collecting section then passes through the water-outlet section of the housing and can be supplied to the outside.

[0030] [7] In order to achieve the above object, the present invention provides a method for producing a water purification material, comprising: a first step of washing and dehydrating source coral particles, removing iron, drying, and sterilizing them to produce coral particles of 0.18 mm or more and less than 0.71 mm, and a first coral raw material of coral particles of 0.71 mm or more and less than 2.0 mm; a second step of producing a second coral raw material by attaching silver to the surface of the first coral raw material; a third step of producing a third coral raw material by firing the coral particles of 0.18 mm or more and less than 0.71 mm obtained in the first step at approximately 600°C; and a step of mixing the first coral raw material in proportions of 60 to 80% by weight, the second coral raw material in proportions of 10 to 30% by weight, and the third coral raw material in proportions of 5 to 15% by weight.

[0031] According to the method for producing a water purification material of the present invention, a water purification material made from each coral raw material having the particle size described in [1] above can be obtained.

[0032] Furthermore, the water purification material produced allows water to pass smoothly through the material, and the water passing through can flow while coming into contact with the entire surface of the particles of the water purification material, thereby achieving a sufficient treatment flow rate and fully demonstrating the functionality required of a water purification material, such as removing impurities and heavy metals from the purified water or adding minerals to the water.

[0033] In addition, since there is a certain degree of freedom in the composition of the coral raw materials, water purification materials can be created with compositions that are appropriately adapted to various conditions in water purification treatment, such as the flow rate of the water to be purified, the size of the water purification cartridge or water purifier, or processing capacity.

[0034] [8] In order to achieve the above object, the present invention provides a water purification method in which water to be purified is introduced into a water-conducting section on the outer periphery of a water purification cartridge, and purified while moving inside the water purification cartridge toward the center thereof in the following order: an outer activated carbon layer; an inner coral layer composed of a mixture of 60 to 80 weight % first coral raw material, which is coral particles having a particle size of 0.71 mm or more and less than 2.0 mm; 10 to 30 weight % second coral raw material, which is coral particles having a particle size of 0.71 mm or more and less than 2.0 mm with silver applied to the surface; and 5 to 15 weight % third coral raw material, which is coral particles having a particle size of 0.18 mm or more and less than 0.71 mm and fired at approximately 600°C; and the purified water is collected in a water-collecting section in the center of the water purification cartridge and supplied through a water outlet section of a housing connected to the water-collecting section.

[0035] According to the water purification method of the present invention, it is possible to purify water by utilizing the coral raw materials with the particle sizes described in [1] above.

[0036] This prevents small coral particles from being included in the water purification material and from filling the gaps between larger particles, preventing clogging caused by small coral particles and impeding water permeability.

[0037] In addition, since the water purification material does not contain large coral particles, it is possible to prevent the large coral particles from being concentrated in one area of ​​the material, which would result in larger gaps between the particles and an unexpected increase in water permeability, making it impossible to maintain functionality.This means that the functionality of purifying water and adding minerals can be stably maintained.

[0038] The water to be purified is treated using a predetermined water pressure, such as the pressure of a water supply. Even when the water is flowing relatively fast, the water can flow while being in contact with the entire surface of the particles of the water purification material. This allows the water purification process to be carried out while exhibiting the necessary functionality as a water purification material, such as adding minerals using coral particles, removing heavy metals, or generating silver ions by attaching silver to the coral particles, thereby preventing the growth of bacteria in the treated water and suppressing decay. [Effects of the Invention]

[0039] The present invention can provide a water purification material, a water purification cartridge, a water purifier, a method for manufacturing a water purification material, and a water purification method that can achieve a sufficient treatment flow rate when using the water purification material, and can fully exhibit the functionality required of a water purification material, such as removing impurities, heavy metals, etc. from the water to be purified, adding minerals to the water, and preventing putrefaction of the treated water. [Brief explanation of the drawings]

[0040] [Figure 1] 1 is a front view illustrating an embodiment of a water purifier according to the present invention, partially illustrating the internal structure. [Figure 2] 1 is a plan view illustrating an embodiment of a water purifier according to the present invention; [Figure 3] 2 is a vertical cross-sectional view showing the structure of a water purification cartridge used in the water purifier of FIG. 1. FIG. [Figure 4] FIG. 1 is an explanatory diagram showing the functionality of the water purification cartridge. DETAILED DESCRIPTION OF THE INVENTION

[0041] The embodiment of the present invention will be described in more detail with reference to FIGS. First, the structure of the water purifier A of the present invention will be described.

[0042] (Water purifier A) The water purifier A has a stainless steel housing 1. The housing 1 has a substantially cylindrical lower container 10 with a bottom, and a substantially cylindrical upper container 12 with a narrowed top that is attached to the opening of the lower container 10 via a fixture 11.

[0043] The bottom of the lower container 10 is raised by a partially spherical curved plate 13 that bulges inward, providing stability for the water purification cartridge 2 (described later). A water conduit 14 leading to the interior of the lower container 10 is provided on the side near the bottom.

[0044] A water purification cartridge 2 is housed inside the housing 1. The water purification cartridge 2 has a substantially disk-shaped lower member 20 and an upper member 21. A water outlet pipe 210 is provided in the center of the upper member 21. Between the lower member 20 and the upper member 21, in order from the outside, are provided a large-diameter outer core 22 and a small-diameter inner core 23 made of hydrostatic pipe, each of which is cylindrical and has the same length and allows water to pass through.

[0045] The inner core 23 is positioned at the center of the lower member 20 and the upper member 21, and the space in the center serves as a water collection section 200, which will be described later. The lower member 20, the upper member 21, the outer core 22, and the inner core 23 form a cartridge case (reference numeral omitted).

[0046] A water-permeable nonwoven fabric 271 is provided on the outside of the outer core 22, and is in close contact with the outer surface. A nonwoven fabric 272 having a larger diameter and slightly smaller than the lower member 20 and the upper member 21 is provided outside the nonwoven fabric 271. An activated carbon layer 27, which is formed activated carbon, is provided between the nonwoven fabrics 271 and 272.

[0047] A coral layer 28 is provided inside the outer core 22, and a nonwoven fabric 281 is provided inside the coral layer 28 and in close contact with the outer surface of the inner core 23. The activated carbon layer 27 and the coral layer 28 form a water purification treatment section (reference numeral omitted), and the outer peripheral side of the activated carbon layer 27, i.e., the nonwoven fabric 272, forms a water-conducting section (reference numeral omitted) over almost the entire surface.

[0048] The water collection section 200 is connected to the water outlet pipe 210 of the upper member 21, and the water supply pipe 3 is connected to the water outlet pipe 210 extending from the upper container 12. The coral layer 28 described above has the following configuration.

[0049] The coral layer 28 is composed of a first coral raw material, which is coral grains with a grain size of 0.71 mm to 2.0 mm, a second coral raw material, which is coral grains with a grain size of 0.71 mm to 2.0 mm with silver attached to the surface, and a third coral raw material, which is coral grains with a grain size of 0.18 mm to 0.71 mm that have been fired at approximately 600°C.

[0050] The coral raw materials are mixed and filled with the following weight percentages: 72% first coral raw material, 18% second coral raw material, and 10% third coral raw material. The manufacturing methods of the first coral raw material, second coral raw material, and third coral raw material are as follows.

[0051] (Water purification material manufacturing method) <First coral raw material manufacturing process> The source coral particles used are what is called "weathered reef-building coral." First, a predetermined amount of source coral particles is sieved through a 2.0 mm sieve, and the coral particles that pass through the sieve are washed with water. The washed coral particles are then dehydrated to a moisture content of 5% or less. Furthermore, by sieving through a 2.0 mm sieve, the coral particles obtained will have a particle size of less than 2.0 mm.

[0052] Next, the dehydrated coral pellets are placed under a 10,000 gauss magnet to remove iron, and then the coral pellets are dried and sterilized. The drying process here keeps the moisture content below 1% to maintain a dry state and preserve quality.

[0053] The coral is then sieved through a 0.71 mm sieve to obtain coral particles with particle sizes of 0.71 mm to 2.0 mm (coral particles that do not pass through the sieve). The "coral particles with a particle size of 0.71 mm to 2.0 mm" obtained in this manner are the first coral raw material.

[0054] <Second coral raw material manufacturing process> First, the first coral raw material (coral particles with a particle size of 0.71 mm to 2.0 mm) obtained in the above-mentioned "first coral raw material manufacturing process" is immersed in a predetermined amount of silver nitrate water. Next, the first coral raw material is removed from the silver nitrate water and reduced by immersing it in a predetermined reduced water (for example, reduced water in which L-ascorbic acid, a reducing agent, is dissolved in water).

[0055] Next, the reduced first coral raw material is baked for a predetermined time in order to improve the silver impregnation rate. The coral particles thus obtained, with a particle size of 0.71 mm to 2.0 mm and silver attached to their surfaces, are the second coral raw material.

[0056] <The third coral raw material manufacturing process> First, in the above-mentioned "first coral raw material manufacturing process," when sieving through a 0.71 mm sieve, the coral particles that pass through the sieve (i.e., coral particles with a particle size of less than 0.71 mm) are further sieved through a 0.18 mm sieve to obtain coral particles with particle sizes of 0.18 mm to 0.71 mm (coral particles that do not pass through the sieve).

[0057] Next, the mixture is fired in a firing furnace at approximately 600°C. The coral particles thus obtained, which have a particle size of 0.18 mm to 0.71 mm and are fired at approximately 600°C, are the third coral raw material.

[0058] <Mixing of coral materials> The first coral raw material is mixed at 78 wt %, the second coral raw material at 12 wt %, and the third coral raw material at 10 wt % to form the coral layer 28, which is a water purification material.

[0059] (Water purification method) Next, a water purification method using the water purifier A will be described with reference to Figures 1 to 4. Figure 4 is an explanatory diagram of the functionality imparted to the purified water by the coral layer 28.

[0060] A water supply hose (not shown) from a water line is connected to the water conduit 14 of the water purifier A. When tap water is supplied from the water conduit 14 at a flow rate of 3.8 L / min, the tap water fills the inside of the housing 1, and the water permeates into the water purification cartridge 2 through the nonwoven fabric 272, which is the water conduit.

[0061] Water that enters the water purification cartridge 2 is treated and purified by the activated carbon layer 27 and the coral layer 28, starting from the outside. That is, the activated carbon layer 27 effectively adsorbs and removes free residual chlorine, turbidity, volatile organic compounds such as chloroform, and other substances from the water. The coral layer 28 then imparts various functional properties to the water. The water purification cartridge 2 treats water by moving it from the outside (outer periphery) to the inside (center), ensuring a large filtration area, preventing clogging and enabling highly efficient water purification.

[0062] In other words, although tap water contains almost no minerals, it can be passed through the water while being in contact with the entire surface of the particles of the coral layer 28, which is a water purification material, and therefore it can be provided with the major minerals such as magnesium, calcium, and sodium contained in the first coral raw material and the third coral raw material.

[0063] The mineral loading capacity of each added amount was 0.2 mg / L for magnesium, 2.1 mg / L for calcium, and 0.3 mg / L for sodium. The third coral raw material was fired at 600°C, which makes it possible to adjust the pH to make the water more alkaline.

[0064] In terms of water purification capacity, the removal rates of free residual chlorine, soluble lead, total trihalomethanes, and PFOS and PFOA were 80% for free residual chlorine with a total filtered water volume of 15,000 L, 80% for soluble lead with a total filtered water volume of 15,000 L, 80% for total trihalomethanes with a total filtered water volume of 10,000 L, and 80% for PFOS and PFOA with a total filtered water volume of 15,000 L.

[0065] In addition, the second coral material generates silver ions from the impregnated silver, which prevents the growth of bacteria in the water and inhibits decay. Specifically, when the filtration capacity was reached, the general bacteria count in the purified water was less than 30 / ml, and no coliform bacteria were detected. Furthermore, after 24 hours of retention, the general bacteria count in the purified water was less than 76 / ml, and no coliform bacteria were detected.

[0066] In the coral layer 28, the coral grains as a whole fall within the grain size range of 0.18 mm to 2.0 mm, excluding small grains of less than 0.18 mm and large grains of 2.0 mm or more.

[0067] This prevents small coral particles from being included in the water purification material and from filling the gaps between larger particles, preventing clogging caused by small coral particles and impeding water permeability.

[0068] In addition, large-sized coral particles are not included in the water purification material, which prevents the large-sized coral particles from being partially concentrated in the water purification material, causing larger gaps between the particles and unexpectedly increasing water permeability, which could make it impossible to maintain functionality.

[0069] Furthermore, the water purifier A can purify tap water at a sufficient flow rate and supply purified water that is rich in minerals. Therefore, the activated carbon layer 27 and coral layer 28 can purify water, add minerals, and perform other functions while maintaining stability. The water purification cartridge 2 should be replaced every 12 months for a daily water purification process of 27 L, which is sufficient for standard use.

[0070] The terms and expressions used in the present specification and claims are merely for explanatory purposes and are not limiting in any way, and are not intended to exclude terms and expressions equivalent to the features described in the present specification and claims and parts thereof. It goes without saying that various modifications are possible within the scope of the technical idea of ​​the present invention. [Explanation of symbols]

[0071] A water purifier 1. Housing 10 Lower container 11 Fixtures 12 Upper container 13 Curved plate 14 Water pipe 2 water purification cartridges 20 Lower member 21 Upper member 210 Outlet pipe 22 outer core 23 Inner Core 200 Water catchment area 27 Activated carbon layer 271 Nonwoven fabrics 272 Nonwoven fabric 28 Coral Layer 281 Nonwoven fabrics 210 Outlet pipe 3 Water supply pipe

Claims

1. A first coral raw material which is a coral particle having a particle size of 0.71 mm or more and less than 2.0 mm; A second coral raw material in which silver is attached to the surface of coral particles having a particle size of 0.71 mm or more and less than 2.0 mm; A third coral raw material obtained by firing coral particles having a particle size of 0.18 mm or more and less than 0.71 mm at approximately 600 ° C. is mixed with the coral raw material at a predetermined weight percentage. Water purification material.

2. The first coral raw material is 60 to 80% by weight, the second coral raw material is 10 to 30% by weight, and the third coral raw material is 5 to 15% by weight. The water purifying material according to claim 1.

3. The first coral material is 72% by weight, the second coral material is 18% by weight, and the third coral material is 10% by weight. The water purifying material according to claim 1.

4. A cartridge case, and a water purification treatment section disposed within the cartridge case, in a direction of purifying water, having an activated carbon layer as a first layer and a coral layer as a second layer, the coral layer being filled with a mixture of 60 to 80 wt % of a first coral raw material which is coral grains having a grain size of 0.71 mm or more and less than 2.0 mm, 10 to 30 wt % of a second coral raw material which is coral grains having a grain size of 0.71 mm or more and less than 2.0 mm with silver applied to the surface thereof, and 5 to 15 wt % of a third coral raw material which is coral grains having a grain size of 0.18 mm or more and less than 0.71 mm and baked at approximately 600°C. Water purification cartridge.

5. Housing and The water purification cartridge is housed in the housing and comprises a cartridge case; and a water purification processing section that is disposed within the cartridge case and has, in a direction of purifying water, an activated carbon layer as a first layer and a coral layer as a second layer, the coral layer being filled with a mixture of 60 to 80 wt % of a first coral raw material that is coral grains having a grain size of 0.71 mm or more and less than 2.0 mm, 10 to 30 wt % of a second coral raw material that is coral grains having a grain size of 0.71 mm or more and less than 2.0 mm with silver applied to the surface thereof, and 5 to 15 wt % of a third coral raw material that is coral grains having a grain size of 0.18 mm or more and less than 0.71 mm and baked at approximately 600°C. Water purifier.

6. The water-conducting portion of the water purification cartridge is provided on the outer peripheral side of the water purification cartridge, and the water-collecting portion of the water purification cartridge is provided in the center, and the water-collecting portion is connected to the water outlet portion of the housing. The water purifier according to claim 5.

7. a first step of washing and dehydrating the source coral particles, removing iron, drying and sterilizing them to produce coral particles of 0.18 mm or more and less than 0.71 mm in size and a first coral raw material of coral particles of 0.71 mm or more and less than 2.0 mm; a second step of producing a second coral raw material by attaching silver to the surface of the first coral raw material; A third step of producing a third coral raw material by firing the coral particles having a size of 0.18 mm or more and less than 0.71 mm obtained in the first step at approximately 600 ° C.; Mixing the first coral raw material at a ratio of 60 to 80% by weight, the second coral raw material at a ratio of 10 to 30% by weight, and the third coral raw material at a ratio of 5 to 15% by weight. Manufacturing method of water purification material.

8. The water to be purified is introduced from the water conveying section on the outer periphery of the water purification cartridge, and purified while moving inside the water purification cartridge toward the center thereof in the following order: an outer activated carbon layer; an inner coral layer composed of a mixture of 60 to 80 wt % of a first coral raw material, which is coral grains with a particle size of 0.71 mm or more and less than 2.0 mm; 10 to 30 wt % of a second coral raw material in which silver is applied to the surfaces of coral grains with a particle size of 0.71 mm or more and less than 2.0 mm; and 5 to 15 wt % of a third coral raw material in which coral grains with a particle size of 0.18 mm or more and less than 0.71 mm are fired at approximately 600°C; and the purified water is collected in a water collection section in the center of the water purification cartridge and supplied through a water outlet section of a housing connected to the water collection section. Water purification method.

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