SR 72sqft System 3 Modular DE Filter An Eco Select Choice: Water flows very efficiently through System:3® Modular D.E. Filters - SMD Series filters allowing the use of smaller pumps or lower pump speeds to minimize energy use. And when consumers rinse cartridges rather than backwash, they can significantly reduce water use, too. 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 Modular Filter Tanks ? Allows for quick change of filter medias without changing the tank 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