This is our best selling problem solver ever! Bear Bomb is a fast acting, non-foaming, non-staining, dry algaecide that works on all types of algae including stubborn black algae! Our Algae Bomb is an absolute must for retailers to have on your shelves. For all you service techs, Bear Bomb is the product to use when you have an algae problem you just can seem to clear up! Nothing works better! 4 ounces treats 10,000 gallons. Baquacil compatible!