No, WB, no polyquat. Water, Bleach, Borax, CYA, and a little Baking Soda... people and toys too. Started this pool new last year. The pool store that sold me the Fiber Clear intimated but wouldn't actually say that DE is illegal. I gave it a shot, I expected more. Perhaps my pump was too small to adequately backwash this stuff out of the 27" filter.