REPLACEMENT D.E. GRIDS These high quality grids are designed for Diatomaceous Earth filter applications. All grids feature reinforced center cores for added durability. Plus, the seams are stitched with heavy duty, chemical-resistant string and are sonic welded to prevent fading. Universal Pro Kit 36 sq. ft. DE Grid includes 7 Large and 1 small Grid Filbur genuine replacement grids are designed for Diatomaceous Earth filter applications. All grids are constructed with a special reinforced center core for added durability. Seams are stitched with heavy duty, chemical resistant string and are sonic welded to prevent fraying. Filburs' custom designed grid cloth will handle more back washing than the competition.