Diatomaceous Earth (DE)

DE is made up of fossilized diatoms (porous, sponge like microscopic organism). It is used in DE filters to provide particularly fine filtering and as an additive for sand filters to improve filtering. Pool grade DE has been heat treated and is a mild carcinogen if the power is inhaled. DE is also available without heat treatment for use in gardening. Gardening DE is safer to handle but doesn’t work at all well in filters.