Harborlite Aqua Perl Pool Filter D.E. 96 lbs. 96 pounds of Aqua Pearl in eight - 12 pound bags Volcanic in origin, Aqua Perl is 100% crystalline silica free A 12 pound bag of Aqua Perl is equivalent to a 25 pound bag of diatomaceous earth 1/2 pound of AquaPerl (1 scoop) = 1 pound of DE (1 scoop) Won't attract oil by-products and lengthens filter cycles