12 oz. Dry - CrystalClear Biological Clarifier Dry is an all natural, premium bacteria and enzyme product designed to remove green water and sludge and to seed biological filters. Once applied it will immediately begin to multiply and work to remove harmful decaying sludge that has accumulated from years of fish waster, dead plants, leaves and many other organic materials. Most naturally occurring bacteria found in ponds cannot keep up with the constant load of organics entering the pond. Therefore, it is often necessary to inoculate ponds with bacteria and enzyme supplements to ensure clear, healthy water. Once the harmful organics and nutrients have been consumed, the by-product excreted by the bacteria is harmless carbon dioxide. It is always a good idea to treat ponds weekly with CrystalClear Biological Clarifier Dry to ensure that a healthy colony of bacteria remain on the filter and in the pond. Fortified with billions of bacteria and a strong enzyme family, CrystalClear Biological Clarifier Dry will supply ample colonies of bacteria to help clear green water and sludge.