Pentair FNS Plus FNSP36 D.E. Pool Filter | EC-180007

Pentair FNS Plus FNSP36 D.E. Pool Filter | EC-180007

The Pentair FNS Plus FNSP36 D.E. Pool Filter (EC-180007) provides 36 square feet of filtration area. The FNS Plus uses curved vertical grids coated with diatomaceous earth. Its removable grid assembly supports inspection and cleaning. Choose this design when you want D.E. filtration and can provide the correct media charge, compatible valve arrangement and routine maintenance.

Specifications

Plan the installation

Choose the FNSP36 by the required circulation flow, media type and service space—not by pool gallons alone. Match the flow rating to the exact filter revision and application in the appropriate manual.

Allow access to the closure, drain and plumbing, with enough overhead room to remove the internal elements or valve. A published service-clearance figure is different from the assembled tank height. Confirm the dimensions of the exact revision before building an enclosure.

Match the manual to your filter

Pentair publishes separate guides for cast-clamp and spring-clamp FNS Plus filters. Identify the clamp and manufacturing revision before ordering service parts or following a tightening procedure. Pentair’s current parts guidance limits spring-clamp kits to filters manufactured before August 2025. Both guides are linked below.

Maintenance and safe operation

Before opening the filter, stop the pump, prevent automatic restart and fully relieve system pressure according to Pentair’s guide. Never loosen or tighten a closure while the filter is pressurized. Have a qualified professional install the filter and explain its startup, cleaning and winterizing requirements.

Frequently asked questions

Is this a complete filter or a replacement element?

This listing is for the FNSP36 filter assembly, exact part EC-180007. Plan for the correct D.E. media and compatible valve arrangement.

How do I know it will work with my pump?

Choose the FNSP36 by the required circulation flow, media type and service space—not by pool gallons alone. Match the flow rating to the exact filter revision and application in the appropriate manual.

Does it need D.E. powder?

Yes. Use the charge specified for your model and cleaning procedure. The D.E. coating is essential to this vertical-grid design.

When should the filter be cleaned?

Record the clean operating pressure after proper startup. Use the model’s manual to determine when to clean and recharge. Changes in pressure or circulation deserve inspection; a calendar alone cannot account for every pool’s debris load.

Where are troubleshooting instructions?

Use the manufacturer’s installation and user guide below. Match your equipment revision before following a service procedure, and contact a pool professional for persistent leaks, trapped air or abnormal pressure.

Manuals and manufacturer resources

• Installation & Troubleshooting — Cast-Clamp Models (PDF)
• Installation & Troubleshooting — Spring-Clamp Models (PDF)
• Manufacturer Product Overview (PDF)
• Pentair FNS Plus product overview
• Pentair ecommerce warranty information

We want you to have quick and easy access to warranty information for all the brands we carry. Please click on the links below to view each manufacturer’s warranty page:

• Pentair Warranty
  
• A&A (Pentair In-Floor) Warranty
  
• Fluidra Warranty (Zodiac / Jandy / Polaris / Caretaker)
  
• Paramount Warranty
  
• BlueSquare Warranty
  
• Hayward Warranty
  
• All Other Manufacturer Warranties
  

Note: Warranty coverage, registration, and service terms are provided directly by the manufacturer. Please review the details carefully to ensure proper understanding of coverage and claim procedures.