SR 53sqft System3 DE Filter System:3?® D.E. Filters - SD Series bring you the proven performance of our diatomaceous earth media in the world's easiest-to-operate D.E. filter. The greater cycle times and minimized maintenance of the System:3?® D.E. Filters - SD Series, coupled with our superior grid system, give you the finest D.E. filter available. Features Typical Installations ? Inground pools, inground hot tubs, and water features Quality Construction ? Durable two-piece tank housing constructed of Dura-Glas?®, Sta-Rite's industry leading glass-reinforced composite resin Safe ? Posi-Lok clamps provide safe, easy access to tank internals Innovative Design ? 2" plumbing throughout combined with Sta-Rite's exclusive rectangular grid system provides superior D.E. filtration Low Maintenance ? Superior backwash capabilities means less manual cleaning of the grids Dual Drain Plugs ? Side plug assembly includes 1-1/2" NPT port for direct discharge plumbing Sleek Looks ? Contemporary style and matte black finish looks attractive in any pool setting