"Shock" is actually a verb-something you do to the pool- rather than a particular product. You can use any form of chlorine to shock the pool, whether it's bleach, cal hypo, or dichlor. To shock actually means to bring the chlorine level up to an elevated level to burn off the bad stuff in your pool. If you still have the container the product came in, look at the ingredient label and post it, and we probably would be able to tell you why the water clouds up.
Bleach is generally the cheapest and most efficient way to shock the pool, since it doesn't add anything extra to the pool other than chlorine and a little salt.
Janet
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