Pro Guard Cellulose Fiber replaces D.E. filter media. Cellulose fiber is a highly effective, bio-degradable, direct filter media replacement for Diatomaceous Earth in D.E. filters. It is easier to use and safer to apply. No pre-mixing with water is necessary. Customers prefer cellulose fiber because it lasts longer than D.E. and is easier to apply than D.E. Pro Guard Cellulose Fiber will improve water clarity. Pro Guard Cellulose Fiber can be used as a filter aid in all filter types. 3 Lbs. of cellulose is equal to 25 Lbs. of D.E.