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    Pentair FNS Plus Fiberglass DE Filter

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    Pentair FNS® Plus diatomaceous earth (D.E.) filters provide you with superior water clarity and self-cleaning convenience with minimal effort!

    The filter removes particles so small they are individually undetectable by the human eye – but collectively combine to decrease water clarity. In addition to providing the clearest possible water, FNS® Plus was also designed for easy maintenance and long-term reliability.

    FNS® Plus features curved vertical grids that will provide the maximum filter surface area for greater dirt-trapping capacity and longer periods between cleanings.

    With a unique internal design, the Pentair FNS® Plus ensures optimum filtration and backwashing efficiency. An easily removable filter grid pack simplifies maintenance and a High Flow™ manual air relief valve and continuous internal air relief valve work together to maintain efficient filtration and prevent over-pressurization. The fiberglass reinforced polypropylene tank provides exceptional strength and long life.

    All FNS® Plus Systems are powered by the Pentair SuperFlo™ pump and come complete with filter tank, 6-way multi-port valve and pressure gauge.


    1-Year Warranty read more
      • Item: # E3683 48 sq ft DE Filter Only (no valve) $1,019.99
      • Item: # E3690 48 sq ft DE Filter Only with valve $1,059.99
        Max. Pool Size (gallons) 46,080
      • Item: # E3725 48 sq ft DE Filter System (with valve and 1-hp pump) $1,549.99
        Max. Pool Size (gallons) 46,080
      • Item: # E3684 Side Mount Valve for Pentair FNS Plus Filter tank $159.99
      • Product Description
      • Customer Review
      • Product Specification
      • MORE INFO


      • Model: FNSP48
      • Effective Filtration Area: 48 sq ft
      • Flow Rate: 96 GPM
      • Turnover Capacity (In Gallons)
      •   -  8 Hour: 46,080
      •   - 10 Hour: 57,600
      •   - 12 Hour: 69,120
      • D.E. Required: 4.8 lbs.

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      Pentair FNS Plus Fiberglass DE Filter dimensions