Aqua Perl Pool Filter D.E. 24 lbs. 24 lbs of Aqua Pearl in 2 - Twelve lb bags Volcanic in origin, Aqua Perl is 100% crystalline silica free. A 12 lb. bag of Aqua Perl is equivalent to a 25 lb. bag of diatomaceous earth. 1/2 lb. of AquaPerl (1 scoop) = 1 lb. of D.E. (1 scoop) Attracts oil by-products and shortens filter cycles.