Pool & Spa Replacement Parts 4024 D.E. Diatomaceous Earth Powder For Swimming. $32.63. Diatomaceous Earth Grid, Purex, Full, 12" for 24 sqft. $31.99. Diatomaceous Earth Grid, Rectangular, 18" x 5" Center Port. $118.68. Swimming Pool Diatomaceous Earth DE Powder Diatomite Filter Media 50 lbs. +2 options.