Celatom diatomaceous earth (DE) for swimming pools provides the ultimate in water clarification for a pool or spa that truly sparkles. DE is the most efficient dirt removing filter aid available, removing particles down to 2 microns. A properly balanced pool, using DE filter aid, gives you the clarity and quality you're looking for, reducing the use of chemicals and disinfectants. The #1 DE filter media in the world for swimming pools. The difference is clear. Harness the power of EP Minerals Celatom Diatomaceous Earth in your pool filter for superior water clarity, capturing even the tiniest impurities with ease. Enhances filter productivity reducing chlorine shock use. Filters out particles associated with recreational water illness Our customers tell us every day ? There's no substitute for Celatom diatomaceous earth (DE) and CelaPerl perlite when it comes to filter aids for swimming pool filters. For over 50 years, EP Minerals' Celatom DE has been the worldwide choice for swimming pool and spa filtration products. EP Minerals unique DE and Perlite have the chemical characteristics that make our products the perfect filter aid for the swimming pool and spa industry.