Zeobest, a safe, naturally occurring, environmentally friendly zeolite filter media, provides DE-like water clarity in sand filters. Our uniform three-dimensional honeycomb structure filters down to 3 to 5 microns just like DE. Zeobest out performs pool filter sand because our surface area is thousands of times greater. Zeobest has the highest Cation Exchange Capacity (CEC) of any zeolite filter media in the US.