Three Letters Re: Clarification on Calcium Hypochlorite for Water Purification
Jim, It has been almost 20 years since I had a chemistry class, so you may want to check this with a chemist. Wanderer posted the following comment: “I stopped at the local Big Box lumber yard and they had Calcium Hypochlorite, (a.k.a. Pool Shock) it was concerning as it states 50% Calcium Hypochlorite and 50% Other Ingredients. Making it a 50% available Chlorine. In common language, … is this adequate? It does not seem to be of the 70% goal you mentioned on your earlier post.” He was referring to the EPA web site comment: “… since the calcium …