Question: what is the difference between sodium dichloro-s-triazinetrione and calcium hypochlorite?
Answer: Cal-Hypo is also called Calcium Hypochlorite, and is 99.18% free and available chlorine. The Cal-Hypo [shock] we sell is 68% calcium hypochlorite, which means 67.4% available chlorine that can fight algae in your swimming pool. ... But, like Dichlor, Cal-Hypo does have a side effect. Cal-Hypo has calcium in it.