Removal Effect of the Water purifier for Home Use against Cryptosporidium parvum Oocysts

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  • MATSUI Toshihiro
    Department of Infectious Diseases, Kyorin University School of Medicine
  • KAJIMA Junko
    Research and Study Department, Japan Association of Parasite Control
  • FUJINO Takashi
    Department of Infectious Diseases, Kyorin University School of Medicine

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Abstract

The removal effects of the faucet mounted type water purifier for home use were examined against Cryptosporidium parvum oocysts. The water purifier is composed of a layer of granular activated carbon and the hollow fiber membrane filter. The cartridges were unused, 25%, 50% and 75% flow down by Arizona-dust of U. S. A. Two respective cartridges were used of the examination. The faucet and the water purifier were connected by anti-pressure tube, and 3.0 × 107 oocysts of Cryptosporidium parvum were injected into anti-pressure tube while water was running. Twenty liter of collected purified water was examined under the fluorescent microscope. Any oocysts in the purified water collected from all cartridges were not found. Therefore, we considered this purifier as an effective one in removing Cryptosporidium oocysts from drinking water.<br>

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