Diatomaceous Earth (DE)

Pool Grade Diatomaceous Earth (DE) is made up of fossilized diatoms (porous, sponge like microscopic organism) and is specifically used in DE filters to provide extremely fine filtering. Pool DE has been heat treated and *not* the same as gardening DE. It is a mild carcinogen if inhaled. Some people with sand filters can learn how to add small amount to their sand filter for improved filtering.