Quote Originally Posted by mackeeg View Post
cal-hypo is just another brand of shock?

Thanks
Cal-hypo is another form of chlorine. "Shock" is actually a verb, something you do to your pool, instead of a noun, a thing. To "shock" only means to raise your chlorine level to a high level, no matter which form of chlorine you use to accomplish this. Some pre-packaged "shocks" contain cal-hypo or calcium hypochlorite, and are a much better chlorine alternative in your situation because it does not add CYA to the water like dichlor does.

Janet