None of the @#$%$ has ever been in my pool. Fiber Clear is the weirdest thing this pool has seen. It may be fine as a DE replacement in a DE filter I don't know. In my experience it didn't help in a sand filter and left me with chunks of newspaper delivered in a thunderstorm and run over by the car. Perhaps it is incompatible with the DHMO that I use in excess.

Sorry, wits, for the Hijack. Follow PoolDoc's advice. He will help you. POP is the one thing you can't overuse.