Calcium Hypochlorite, also known as High Test Hypochlorite (HTH) is supplied in crystal form; it is nearly 70% available chlorine.This is the most effective method of field chlorine treatment.
One product, the Sanitizer (formally the Sierra Water Purifier) uses these crystals to super-chlorinate the water to insure pathogens were killed off, then hydrogen peroxide is added to drive off the residual chlorine. Though a test kit, rather than superchlorination, is used to insure enough chlorine is added.
This is preferable for large-scale systems, as the residual chlorine will prevent recontamination.
Usually bulk water treatment plants first dilute to HTH to make a 1 % working solution at the rate of 14g HTH per liter of water. While testing to determine exact chlorine needs are preferable, the solution can be used at the dose rate of 8 drops/gallon, or for larger quantities, 1 part of 1% solution to 10,000 parts clear water. Either of these doses will result in 1 PPM chlorine and may need to be increased, if the water wasn’t already filtered by other means.
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