JPS6197095A - Body construction of city water cleaning up device - Google Patents
Body construction of city water cleaning up deviceInfo
- Publication number
- JPS6197095A JPS6197095A JP59220782A JP22078284A JPS6197095A JP S6197095 A JPS6197095 A JP S6197095A JP 59220782 A JP59220782 A JP 59220782A JP 22078284 A JP22078284 A JP 22078284A JP S6197095 A JPS6197095 A JP S6197095A
- Authority
- JP
- Japan
- Prior art keywords
- water
- activated carbon
- silver
- filter layer
- bacteria
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Filtration Of Liquid (AREA)
- Water Treatment By Sorption (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は水道水浄水器（以下、単に浄水器という。）
の改良構造に関し、詳しくは浄水器の浄化処理部となる
本体の改良構造に係わるものである。[Detailed Description of the Invention] (Industrial Application Field) This invention is a tap water purifier (hereinafter simply referred to as a water purifier).
More specifically, the present invention relates to an improved structure of the main body of the water purifier, which serves as the purification processing section.
（従来の技術）
水道水を浄化する従来の浄水器の濾過層は、活性炭単独
によるものが多かった。そして、この浄水器では、水道
水中の残留塩素が活性炭により完全に除去されるため、
浄水、器を長時間停止（開栓）した際には殺菌作用のな
い器内水が活性炭の濾過層に残り、濾過層内にｍ菌が増
殖することとなり、浄水器の使用初期数分間に排出され
る水は飲用に適さない問題点があった。(Prior Art) The filtration layer of conventional water purifiers that purify tap water was often made of activated carbon alone. This water purifier uses activated carbon to completely remove residual chlorine in tap water.
When the water purifier is stopped (opened) for a long time, the water inside the container, which has no sterilizing effect, remains in the activated carbon filtration layer, causing bacteria to multiply in the filtration layer, and the water purifier may be used for a few minutes during the first few minutes of use. There was a problem that the water discharged was not suitable for drinking.
そこで、これを解決するために、銀を担持させた銀活性
炭を浄水器に用いて水道水を浄化することも試みられて
いるが、銀活性炭に接触部分の水はｍ菌の増殖が抑制さ
れるが、排水口などの水は銀活性炭に接触しないため空
気中からの汚染を受けて細菌を含み開栓直後の水には大
量、の細菌の検出が見られる問題点があった。Therefore, in order to solve this problem, attempts have been made to purify tap water by using silver-loaded activated carbon in water purifiers, but the growth of M bacteria is inhibited in the water that comes into contact with the silver activated carbon. However, since the water from drains does not come into contact with the silver activated carbon, it is contaminated from the air and contains bacteria, and a large amount of bacteria can be detected in the water immediately after the tap is opened.
（発明が解決しようとする問題点）
しかして、この発明は上記した従来の問題点を解決しよ
うとしたものであり、活性炭による通常の浄化処理は充
分であり、かつ長時間の開栓時にｌＩｌ閑の増殖がなく
、長時間開栓後の開栓初期に細菌の心配のない飲料水が
得られる、銀活性炭濾過式の浄水器を提供することにあ
る。(Problems to be Solved by the Invention) However, the present invention is an attempt to solve the above-mentioned conventional problems, and it is clear that normal purification treatment using activated carbon is sufficient and that lI l To provide a silver activated carbon filtration type water purifier which does not cause idle growth and provides drinking water free from bacteria at the initial stage of opening after being opened for a long time.
（問題点を解決するための手段）
そこで、前記問題点を解決するための本発明の手段（よ
以下のようになされる。すなわち、本発明では、ケース
内に銀活性炭が充填され、ケースの一方より供給された
水道水が銀活性炭の濾過層を通って他方の出口から排出
される浄水器の本体において、前記銀活性炭は銀を約０
゜１〜１，０重量％担持さぜた銀担持活性炭であり、前
記銀活性炭の濾過層の外周あるいは内部には通水スポン
ジ材などの通水性でかつ保水性を有する保水部材を、濾
過層の通水方向長とほぼ等しく、かつ通水方向直角断面
が濾過層断面に対して極小となるように配置旭しめてな
るものとされる。そして′ａ道層と保水部材の流水ｍ比
としては約４対１〜２０対１程度が望ましい。なお、本
発明における水道水は塩素殺菌された通常の水道水の他
、河川、湖水、井戸などを水源として塩素系の滅菌処理
を施し、飲用に供する水をいうものである。(Means for Solving the Problems) Therefore, the means of the present invention for solving the above-mentioned problems are as follows. Namely, in the present invention, the case is filled with silver activated carbon, and the case is filled with silver activated carbon. In the main body of the water purifier, tap water supplied from one side passes through a filtration layer of silver activated carbon and is discharged from the other outlet, and the silver activated carbon removes about 0 silver.
゜It is silver-supported activated carbon that carries 1 to 1.0% by weight, and a water-retaining member having water-permeable and water-retaining properties such as a water-permeable sponge material is placed on the outer periphery or inside of the filtration layer of the silver activated carbon. The length of the filter layer is approximately equal to the length of the filter layer in the water flow direction, and the cross section perpendicular to the water flow direction is minimized with respect to the cross section of the filtration layer. The ratio of flowing water between the 'a-way layer and the water retaining member is preferably about 4:1 to 20:1. In addition to ordinary tap water that has been sterilized with chlorine, tap water in the present invention refers to water sourced from rivers, lakes, wells, etc. that has been subjected to chlorine-based sterilization treatment and made available for drinking.
（作用）
この発明においては、銀活性炭により水の濾過（浄化）
処理が行なわれる。銀活性炭の活性炭部分は塩素や他の
臭気成分や汚染成分の吸着作用をなし、銀活性炭の銀部
分は接触水の抗菌作用をなす。(Function) In this invention, water is filtered (purified) by silver activated carbon.
Processing is performed. The activated carbon part of the silver activated carbon acts as an adsorbent for chlorine and other odor components and pollutants, and the silver part of the silver activated carbon acts as an antibacterial agent for contact water.
開栓時の銀活性炭濾過層の水は、塩素が除去されている
が、銀部分との接触によってｌｌｌ菌の増殖が防止され
る。銀活性炭濾過層に設置された保水部材は、塩素を含
有する水が保水されているため、濾過層の排水口側の侵
入細菌はこの塩素弁によって増殖防止される。Although chlorine has been removed from the water in the silver activated carbon filtration layer when the bottle is opened, the growth of bacteria is prevented by contact with the silver part. Since the water retaining member installed in the silver activated carbon filter layer retains water containing chlorine, the proliferation of bacteria entering the drain port side of the filter layer is prevented by the chlorine valve.
一方、開栓時においては水道水の大部分は銀活性炭の濾
過層を通り濾過処理がされ、水道水の撞く一部は保水部
材を介して濾過層出口に送られ、銀活性炭の大ｆｆｌ′
ａ過処理水と混合される。On the other hand, when the tap is opened, most of the tap water passes through the silver activated carbon filtration layer and is filtered, and a part of the tap water is sent to the filtration layer outlet via the water retaining member, and the silver activated carbon filtration layer is filtered.
a Mixed with over-treated water.
すなわち、銀活性炭により濾過周内の細菌増殖を抑制し
、かつ通水性の保水部材からの脱塩素されない水を、濾
過処理水に一部混入させることで、濾過層出口付近での
殺菌効果を維持しようとするものである。In other words, the silver activated carbon suppresses bacterial growth within the filtration periphery, and the sterilization effect near the filtration layer outlet is maintained by partially mixing undechlorinated water from the water-permeable water retaining member into the filtered water. This is what I am trying to do.
（実施例）
次に、この発明の一実施例を図面にしたがって説明する
。(Example) Next, an example of the present invention will be described with reference to the drawings.
第１図に示す浄水器１は水道コックにの蛇口ＫＡなどに
接ｖｃ導管Ｈを介して接続して使用されるものであり、
導水孔３を有する基盤２と、基盤２上に立設されかつ濾
過層９及び保水部材７が収納された円筒状のケース５と
、ケース５上部に取付けられかつ排水管１２を右する蓋
体１１とよりなる。The water purifier 1 shown in FIG. 1 is used by being connected to a faucet KA of a water tap via a VC conduit H.
A base 2 having a water guide hole 3, a cylindrical case 5 standing on the base 2 and housing a filtration layer 9 and a water retaining member 7, and a lid attached to the upper part of the case 5 and covering a drain pipe 12. It consists of 11 and more.
３Ａは導水孔３外端に形成された接続導管Ｈの接続部で
あって、導水用の口部とされる。前記基盤２の上面には
環状の螺合片４が形成され、ケース５下端部が螺合され
ている。７°はケース５内周面に沿って環状に配置され
た保水部材であって、通水スポンジ材などの通水性でか
つ保水性を有する材質のものである。９は環状の保水部
材７の内部に銀活性炭８〜８を充填して形成される円筒
カラム状の濾過層である。すなわち、濾過層９外周は保
水部材７によって被着された構造にされている。濾過層
９及び濾過層９を被う保水部材７の上下の端部には網体
などの通水板６，１０が取付けられている。通水板６．
１０はケース５内面に形出された突起状の係止片５Ａ、
５Ｂにて止着されている。なお、保水部材７の被着され
た濾過Ｆ１９はカートリッジ式となして取替えに便利に
してもよい。銀活性炭８は硝酸銀水溶液に活性炭の粉体
又は粒体を浸漬したのち、水洗乾燥する通常の処理によ
り得られるものであり、銀成分を約０．０５〜１．０重
量％（以下、単に％と略記する。）担持されたものが使
用される。銀の担持量１よ０．０５％以上であれば水道
水基準である細菌約１００をこえることはない。０．２
％以上であれば細菌の発生は全くないが、銀担持削があ
まり多すぎると飲用上、良くないのでその範囲は約０．
０５〜１．０％程度が好ましい。3A is a connecting portion of a connecting conduit H formed at the outer end of the water guiding hole 3, and is used as a mouth portion for water guiding. An annular screwing piece 4 is formed on the upper surface of the base plate 2, and a lower end portion of the case 5 is screwed into the ring-shaped screwing piece 4. 7° is a water retaining member arranged annularly along the inner peripheral surface of the case 5, and is made of a water permeable and water retaining material such as a water permeable sponge material. Reference numeral 9 denotes a cylindrical column-shaped filter layer formed by filling the inside of the annular water retaining member 7 with silver activated carbons 8 to 8. That is, the outer periphery of the filtration layer 9 is covered with the water retaining member 7. Water passing plates 6 and 10 such as nets are attached to the upper and lower ends of the filtration layer 9 and the water retaining member 7 that covers the filtration layer 9. Water passage board 6.
10 is a protruding locking piece 5A formed on the inner surface of the case 5;
It is fixed at 5B. Note that the filtration F19 to which the water retaining member 7 is attached may be of a cartridge type to facilitate replacement. Silver activated carbon 8 is obtained by the usual process of immersing activated carbon powder or granules in an aqueous silver nitrate solution, washing with water, and drying. (abbreviated as ) is used. If the amount of silver supported is 0.05% or more, it will not exceed the tap water standard of about 100 bacteria. 0.2
If the content is more than 0%, there will be no bacteria at all, but if there is too much silver supported, it is not good for drinking, so the range is about 0%.
It is preferably about 0.05 to 1.0%.
前記蓋体１１の排水管１２は濾過処理水を排出するもの
であって、蓋体１１中央部に一端１２△が回転自在に取
付けられ排水口となる他端１２Ｂは下方向きに形成され
ているものである。なお、本例浄水器における基盤２．
ケース５．蓋体１１の各接続部分はパツキン（図示せず
。）を介して水密状に接続される。The drain pipe 12 of the lid 11 is for discharging filtered water, and one end 12Δ is rotatably attached to the center of the lid 11, and the other end 12B, which serves as a drainage port, is formed downward. It is something. In addition, the base 2 in this example water purifier.
Case 5. Each connection part of the lid body 11 is connected in a watertight manner through a gasket (not shown).
さて、本例の浄水器１の開栓時は、基盤２の導水孔３よ
り器内に入った水道水は、通水板６を介して濾過層９に
入り上昇し銀活性炭８の作用を受【プで塩素などが除去
されて濾過処理水とされる。Now, when the water purifier 1 of this example is opened, tap water enters the container from the water introduction hole 3 of the base 2, enters the filter layer 9 through the water passage plate 6, rises, and is affected by the action of the silver activated carbon 8. Chlorine and other substances are removed from the water at the receiving end and the water is made into filtered water.
一方、導水孔３より器内に入った水道水の極く一部（極
く少量）は濾過ｍ９外周の保水部材７に入り保水部材７
内を上昇し、濾過層９上部にて濾過処理水と混合され、
排水管１２を経て口部１２Ｂより浄水（ｉ！！過処過水
理水して排出される（第３図矢印部分参照）。保水部材
７を通過する水道水は掻く少量であるため、浄水に混合
されても水質には何ら影響がないものである。銀活性炭
８よりなる濾過層９と、保水部材７とのｍ的比率は通水
方向（流水方向）直角断面において保水部材７は濾″Ａ
層９に対し極めて小さくなるようにされ、かつ濾過層９
の通水方向長とほぼ等長にされる。On the other hand, a very small portion (very small amount) of the tap water that entered the vessel through the water guide hole 3 enters the water retaining member 7 on the outer periphery of the filter m9.
and mixed with filtered water at the top of the filtration layer 9,
Purified water is discharged from the mouth 12B through the drain pipe 12 (see the arrow in Fig. 3).The tap water that passes through the water retaining member 7 is a small amount, so the water is purified. The m-ratio of the filter layer 9 made of silver activated carbon 8 and the water retaining member 7 is such that in a cross section perpendicular to the water flow direction (water flowing direction), the water retaining member 7 has no effect on the water quality. ″A
filtration layer 9
The length is approximately equal to the length in the water flow direction.
そして、浄水器１を停止（開栓）させた際に器内に残留
する水は、濾過層９の銀活性炭８の銀成分の抗菌作用に
加え、保水部材７に保水された水道水の微量の塩素分が
作用することにより、浄水器１停止中における器内水の
細菌増殖が防止される。When the water purifier 1 is stopped (opened), the water remaining in the container is not only affected by the antibacterial action of the silver component of the silver activated carbon 8 in the filtration layer 9, but also by the trace amount of tap water retained in the water retaining member 7. By the action of the chlorine component, bacterial growth in the water inside the water purifier 1 is prevented while the water purifier 1 is stopped.
次に本例浄水器１による実験例を示す。Next, an experimental example using the water purifier 1 of this example will be shown.
実験例
内径１１００ａ長さ２５０ｊ１１の濾過層外周に厚さ１
０厘の連続気泡よりなるスポンジ材の保水部材を形成し
、その内部に０．２％銀活性炭を充填したもの。Experimental example A filter layer with an inner diameter of 1100a and a length of 250j and a thickness of 1 on the outer periphery.
A water-retaining member made of sponge material consisting of open cells of 0.0 liters, and filled with 0.2% silver activated carbon.
比較対照Ａ
前記実験例と同じ濾過層に０．２％銀活性炭を充填し、
保水部材をなくしたもの。Comparison control A The same filtration layer as in the above experimental example was filled with 0.2% silver activated carbon,
The one without the water retaining member.
比較対照Ｂ
前記実験例と同じ濾過層にスポンジ材の保水部材を形成
し、その内部に通常の活性炭（銀担持しない活性炭）を
充填したもの。Comparison Control B: A water retaining member made of sponge material was formed on the same filtration layer as in the above experimental example, and the inside thereof was filled with ordinary activated carbon (activated carbon that does not support silver).
上記の３点につき残留塩素０．５ｐｐｍ含む水道水を５
００Ｊ／ｈで１０時間連続通水後、２４時間通水を停止
させ、開栓後の濾過処理水の細菌数を調べた。Tap water containing 0.5 ppm of residual chlorine for each of the above three points
After continuous water flow for 10 hours at 00 J/h, water flow was stopped for 24 hours, and the number of bacteria in the filtered water after opening the tap was examined.
この結果は下表に示す通りであった。The results were as shown in the table below.
表
なお、１時間処理後の残留塩素は実験例では０、 Ｏ４
ｐｐｍ、比較対照Ａでは０．０１ｐｐｍ、比較対照Ｂで
はｏ、 Ｏ５ｐｐｍであった。そして濾過層と保水部材
の流水缶化は約９対１である。In the table, the residual chlorine after 1 hour treatment was 0 in the experimental example, O4
ppm, 0.01 ppm for comparative control A, and 0.05 ppm for comparative control B. The ratio between the filter layer and the water retaining member is approximately 9:1.
比較対照Ａでは出口付近においてａ閑の増殖があり、こ
れが洗い流されるまでに約１０秒の要し、比較対照Ｂで
は開栓直後の細菌数は少ないが、活性炭自体に殺菌効果
がないためその内部にて、大量増殖し、流されるまで１
分以上を要した。これらに比較して本実験例のものに於
ては開栓直後より連続して無菌の濾過水が得られた。In comparison control A, there was a quiet growth near the outlet, and it took about 10 seconds for this to be washed away, and in comparison control B, the number of bacteria was small immediately after opening, but since the activated carbon itself has no bactericidal effect, 1 until it multiplies in large numbers and is washed away.
It took more than a minute. Compared to these, in the case of this experimental example, sterile filtered water was continuously obtained immediately after opening the bottle.
前記した実施例の保水部材７は濾過層９外周に配置した
が、第４図及び第５図に示す浄水器２１の保水部材２７
はｍ″ＡＦｉ２９内の通水方向に濾過層長とほぼ等しく
、かつ通水方向直角断面が濾過層断面に対して極めて小
さくなるように配置するようにしてもよい。そして、こ
の場合において器内に導入された水道水の大部分は、第
６図に示すように、銀活性炭８の濾過層２９部分を通り
、滅過処理されるが、水道水の撞く一部は保水部材２７
を介して上昇し、銀活性炭８処理を受けた水と混合され
て濾過処理水とされる（第６図矢印部分参照）。Although the water retaining member 7 in the above-described embodiment was arranged around the outer periphery of the filtration layer 9, the water retaining member 27 of the water purifier 21 shown in FIGS. 4 and 5
m'' may be arranged so that it is approximately equal to the length of the filtration layer in the water flow direction in the AFi 29, and the cross section perpendicular to the water flow direction is extremely small with respect to the cross section of the filtration layer. As shown in FIG. 6, most of the tap water introduced into the filter passes through the filtration layer 29 of silver activated carbon 8 and is sterilized, but a portion of the tap water is filtered through the water retaining member 27.
The water rises through the water and is mixed with water that has been treated with silver activated carbon 8 to form filtered water (see arrows in Figure 6).
そして、この浄水器２１の停止時には、前記実庫例の場
合と同様に銀成分の抗菌作用と、保水部材に含まれる水
道水の微量の塩素分にて器内残留以上説明したように本
発明は、銀活性炭の濾過層に通水性の保水部材を配置せ
しめたため、水道水中の塩素など微ｍ成分の除去がされ
飲用に好ましい水となし得るものであり、この浄水器の
停止時は濾過層銀活性炭の銀成分の抗菌作用及び保水部
材に含まれる微ｍの塩素分により器内水のｍ菌増殖の防
止がなされるものである。したがって、本発明の浄水器
においては開栓直後においてｍ菌増殖のない好適な飲用
水が得られる。When the water purifier 21 is stopped, the antibacterial action of the silver component and the trace amount of chlorine in the tap water contained in the water retaining member remain in the water purifier 21 as described above, as in the case of the actual storage example. Because a water-permeable water retaining member is placed in the silver activated carbon filter layer, trace elements such as chlorine in tap water can be removed, making the water preferable for drinking.When the water purifier is stopped, the filter layer is removed. The antibacterial action of the silver component of the silver activated carbon and the minute chlorine content contained in the water retaining member prevent the growth of microorganisms in the water inside the container. Therefore, in the water purifier of the present invention, suitable drinking water without proliferation of microorganisms can be obtained immediately after opening the tap.
図は本発明の一実施例を示すものであり、第１図は浄水
器の縦断面図、第２図は第１図ＩＩ−ＩＦ線における拡
大断面図、第３図は浄水器要部の作用説明図、第４図は
別実施例の浄水器縦断面図、第５図は第４図ｖ−ｖ線に
おける拡大断面図、第６図は浄水器要部の作用説明図で
ある。
１．２１・・・（水道水）浄水器
２・・・基盤
３・・・導水孔
５・・・ケース
７．２７・・・保水部材
８・・・銀活性炭
９．２９・・・濾過層
１１・・・蓋体
１２・・・排水管The figures show one embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of a water purifier, Fig. 2 is an enlarged sectional view taken along line II-IF in Fig. 1, and Fig. 3 is a main part of the water purifier. FIG. 4 is a longitudinal sectional view of a water purifier according to another embodiment, FIG. 5 is an enlarged sectional view taken along line v--v in FIG. 4, and FIG. 6 is an explanatory view of the main parts of the water purifier. 1.21...(Tap water) Water purifier 2...Base 3...Water guide hole 5...Case 7.27...Water retaining member 8...Silver activated carbon 9.29...Filtration layer 11... Lid body 12... Drain pipe
Claims (1)
された水道水が銀活性炭の濾過層を通って他方の出口か
ら排出される浄水器の本体において、前記銀活性炭は銀
を約０．０５〜１．０重量％担持させた銀担持活性炭で
あり、前記銀活性炭の濾過層の外周あるいは内部には通
水スポンジ材などの通水性でかつ保水性を有する保水部
材を、濾過層の通水方向長とほぼ等しく、かつ通水方向
直角断面が濾過層断面に対して極小となるように配置せ
しめてなることを特徴とした水道水浄水器の本体構造。In the main body of the water purifier, the case is filled with silver activated carbon, and tap water supplied from one side of the case passes through a filter layer of silver activated carbon and is discharged from the other outlet, and the silver activated carbon contains approximately 0.05 silver. It is silver-supported activated carbon loaded with ~1.0% by weight, and a water-retaining member having water-permeable and water-retaining properties, such as a water-permeable sponge material, is placed on the outer periphery or inside of the filtration layer of the silver activated carbon. A main body structure of a tap water purifier, characterized in that the main body structure of a tap water purifier is arranged so that the length in the direction is substantially equal to the length and the cross section perpendicular to the water flow direction is extremely small with respect to the cross section of the filtration layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59220782A JPS6197095A (en) | 1984-10-19 | 1984-10-19 | Body construction of city water cleaning up device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59220782A JPS6197095A (en) | 1984-10-19 | 1984-10-19 | Body construction of city water cleaning up device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6197095A true JPS6197095A (en) | 1986-05-15 |
| JPS6314676B2 JPS6314676B2 (en) | 1988-03-31 |
Family
ID=16756483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59220782A Granted JPS6197095A (en) | 1984-10-19 | 1984-10-19 | Body construction of city water cleaning up device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6197095A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0332992U (en) * | 1989-07-28 | 1991-03-29 | ||
| KR20040002321A (en) * | 2002-06-25 | 2004-01-07 | 신동기 | Faucct Devices Using Charcoal and Silver |
| JP2007029836A (en) * | 2005-07-26 | 2007-02-08 | Toray Ind Inc | Apparatus for treating city water |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6915811B2 (en) * | 2001-12-04 | 2005-07-12 | Arch Chemicals, Inc. | Chemical feeder |
-
1984
- 1984-10-19 JP JP59220782A patent/JPS6197095A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0332992U (en) * | 1989-07-28 | 1991-03-29 | ||
| KR20040002321A (en) * | 2002-06-25 | 2004-01-07 | 신동기 | Faucct Devices Using Charcoal and Silver |
| JP2007029836A (en) * | 2005-07-26 | 2007-02-08 | Toray Ind Inc | Apparatus for treating city water |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6314676B2 (en) | 1988-03-31 |
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