Dive into crystal clear water Each & every time you swim with the superior strength & effectiveness of Diatomaceous earth swimming pool filter powder. This high-grade de filter powder can filter down to 3-5 microns in size & leaves water sparkling & Crystal clear without clumping. This de powder is porous, all-natural & created from the fossilized exoskeletons of plants known as diatoms. It delivers an astounding level of filtration & ensures efficiency so your filter will always operate at its peak level. This value-priced de powder not only leaves water shimmering & sparkling with clean, pure beauty, but it will also reduce the amount of time you spend maintaining your pool & save you money on pool supplies. Recommended amounts: 4 lb For Above-Ground de filters & 8 lb For in-ground de filters.