These are replacement test strips for those supplied with the H2gO^® Purifier. They are used to ensure that there is adequate chlorine residual in cloudy water prior to initiating the Cryptosporidium wait period. Package contains 25 test strips in a foil pouch with instructions for use.

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(Note that independent testing with the H2gO^® Purifier demonstrates bacteria and virus kill in all waters with a 2.5 mg/L dose, Giardia kill in all waters with a 5 mg/L dose, and Cryptosporidium kill in clear water with a 5 mg/L dose — test strips are not needed in any of these cases. However, since the organic material in dirty water can react with disinfectant, and Cryptosporidium kill requires a longer wait period, the strips can be used to ensure there is adequate chlorine residual in dirty water at the beginning of the Crypto wait period.)