Pentair 72 SqFt PLD Series System: 3 Modular D.E. Filter

The Pentair Sta-Rite® System:3® S7MD72 is a premier 72 square foot modular diatomaceous earth (D.E.) filtration vessel expertly engineered to deliver maximum water polishing capability for large residential inground swimming pools, high-volume spas, and intricate commercial water features. Merging the unparalleled particle-trapping capacity of D.E. media—which safely strains out fine dust, pollen, and microscopic algae down to an incredible 3 to 5 microns—with the physical layout of modular cartridge engineering, this hybrid powerhouse simplifies historic maintenance hassles by allowing owners to open the tank and rinse the internal element assembly completely in-place without disassembling a complex, multi-grid layout. The stout two-piece tank housing is injection-molded from Dura-Glas™, a proprietary high-density fiberglass-reinforced composite resin that provides absolute immunity to chemical scaling, corrosion, and severe outdoor weathering under a maximum continuous operating pressure of 50 PSI. Its highly balanced, computer-optimized internal flow profile prevents water channeling to evenly coat the internal media core, supporting a robust continuous performance range of 72 to 108 gallons per minute (GPM) and a maximum design threshold of up to 144 GPM to partner flawlessly with modern energy-saving variable speed pumps. Routine seasonal service and winterization cleanouts are streamlined by heavy-duty, low-profile Posi-Lok™ split-tank safety clamps for fast tool-free access, a continuous high-flow internal air relief valve, and a convenient dual-drain plug network featuring a 1.5-inch NPT side discharge port. The dry product weight of the Pentair System:3 S7MD72 filter tank body is approximately 101 pounds (with a boxed shipping weight of roughly 117 pounds, noting that full operational configuration requires an initial media precoat charge of 11 pounds of standard D.E. filter powder), yielding pool operators a structurally superior, energy-efficient, and low-maintenance cornerstone for advanced water quality management pads.