. I'll head to walmart. aLTHOUGH THAT kind of grosses me out. Is it safe for humans?: I go through great length to keep animal fecees(sp) away from the water.

OK. I knew that was coming. It is the same bacteria/enzymes as used in pond microbes. There are several strains that eat cellulose, fats, lipids, oils, etc. It or the very expensive microbe lift will take a while to do any good and work much better when aeration is used since they are aerobic(needs O2)to work.

I think you are beginning to understand, you can swim in a fish pond, but hard to keep a fish pond looking like a swimming pool. ;\)