Pentair | 180007 | FNS Plus 36‑sq‑ft DE Filter — 72 GPM High‑Capacity Fiberglass Pool Filtration

The Pentair 180007 FNS Plus DE filter delivers 36 sq ft of filtration area and 72 GPM flow rate. Built with a fiberglass‑reinforced polypropylene tank, curved vertical grids, and features like integrated high‑flow air relief and top‑to‑bottom backwash for efficient, durable pool filtration.

Key Features

• 36 sq. ft. effective filtration area for higher dirt loading and longer intervals between cleanings 

• 72 GPM (gallons per minute) design flow rate

• Constructed with a chemical‑resistant fiberglass‑reinforced polypropylene tank for strength and long life 

• Curved vertical grids to maximize surface area and improve filtration efficiency 

• Integrated Continuous High Flow™ internal air relief for maintaining performance and preventing air lock issues 

• High Flow manual air relief valve for quick manual venting when needed 

• Top‑to‑bottom backwash for complete cleaning of the grid pack 

• Service‑Ease™ grid pack: grids designed for simpler removal/maintenance

• 2‑inch plumbing connection compatibility (valve sold separately) 

• 1‑1/2‑inch bottom clean‑out (drain) port for easier draining and maintenance

Product Overview

The Pentair 180007 FNS Plus (FNSP36) is a high‑capacity DE (diatomaceous earth) pool filter engineered to deliver excellent water clarity with lower maintenance. With 36 sq ft of effective filtration surface and a 72 GPM flow rating, it is well suited for residential or light commercial pools that require robust, efficient filtration performance.

The tank is built of fiberglass‑reinforced polypropylene, giving superior resistance to corrosion and chemical degradation compared to traditional materials. The curved vertical grids increase the available filtration area, which helps trap dirt and debris more effectively and extends the time between required cleanings.

Key design enhancements include the integrated Continuous High Flow™ internal air relief system and a high‑flow manual air relief valve — both of which prevent air buildup, ensuring consistent filtration performance. Backwashing is facilitated by a top‑to‑bottom flow path that more fully cleans the grid pack. The Service‑Ease™ grid pack simplifies maintenance by allowing grid removal one at a time, reducing effort and downtime.

Installation flexibility is aided by a sizeable bottom clean‑out port (1½"), standard‑sized plumbing connections (2"), and smart valve compatibility (valves sold separately). Operating limits include a maximum continuous pressure of 50 PSI, making this filter suitable for many common pool setups.

If you want crystal‑clear water, durable filtration, and reduced cleaning frequency, the Pentair 180007 FNS Plus is a strong choice.