Volume 29, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



None of the available chemical methods for disinfecting drinking water has ever been tested for its ability to destroy cysts. We tested the ability of six such methods to act against , using excystation as the criterion of viability. Two water qualities (cloudy and clear) and two temperatures (3 and 20°C) were tested. At 20°C, using cloudy and clear water, all of the methods proved completely effective. However, at 3°C, in cloudy water one method (“saturated” iodine) was less than completely effective, and in clear water four methods (bleach, Globaline, tincture of iodine and “saturated” iodine) failed to destroy all of the cysts. The failure of these methods appears to be related to either an insufficient halogen residual or contact time. This study underlines the importance of considering water temperature when employing halogen disinfection methods.


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