Pentair 48 SqFt Plus D.E. Filter

Pentair FNS® Plus 48 Sq. Ft. Vertical Grid D.E. Filter (EC-180008)

The Pentair FNS® Plus 48 Square Foot Vertical Grid Diatomaceous Earth (D.E.) Filter (Product #: EC-180008 / FNSP48) is a premier, high-capacity residential water filtration system optimized for online retail distribution and engineered to provide unmatched, commercial-grade water polishing for medium-to-large inground swimming pools. This advanced system utilizes the unparalleled particle-trapping efficiency of diatomaceous earth—a microscopic powder that captures fine dust, pollen, and organic particles down to an incredible 3 to 5 microns—coating a specialized Service-Ease™ grid pack assembly. Composed of eight custom-curved, heavy-duty vertical grid elements organized systematically around a central hub, the grid configuration maximizes total surface area consistency while streamlining manual disassembly for seasonal deep cleaning. The exceptionally rugged tank body is injection-molded from a specialized fiberglass-reinforced polypropylene composite, creating a seamless, chemical-resistant unibody shell that yields superior structural strength, permanent immunity to rust, and complete protection against harsh UV weathering under a maximum continuous operating pressure of 50 PSI. Engineered with computer-optimized internal hydraulics and oversized 2-inch plumbing connections, the filter minimizes backpressure to comfortably handle a powerful maximum design flow rate of up to 96 gallons per minute (GPM), working in seamless synergy with energy-saving variable speed pumps to minimize operational electricity costs. Routine operation and servicing are simplified by a heavy-duty tension-control clamp band with an integrated safety latch for secure tank access, a continuous High Flow™ internal air relief system, and a conveniently positioned 1-inch bottom drain plug for fast, efficient cleanouts and total winterization draining. Shipped open with side-mount bulkhead ports to accommodate user-selected multiport backwash manifolds or slide valves, the dry weight of the Pentair FNS Plus 48 D.E. Filter tank body is approximately 76 pounds (with a boxed shipping weight of roughly 80 pounds, noting that a full operational deployment requires an initial precoat charging of 4.8 pounds of standard D.E. filter powder), providing discerning pool owners with an incredibly durable, low-resistance, and highly advanced cornerstone for pristine water quality networks.