Pentair - EC-180008 - 48 Sq. Ft. DE Pool Filter - Limited Warranty

EC-180008 - 48 Sq. Ft. DE Pool Filter - Limited Warranty

Pentair - EC-180008 - 48 Sq. Ft. DE Pool Filter - Limited Warranty

Item No. 387216
Manufacturer SKU: EC-180008
3.6 out of 5 Customer Rating
The Pentair FNS Plus 48 sq. ft. D.E. Pool Filter is designed with a fiberglass-reinforced polypropylene tank that enhances durability. More Details
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The Pentair FNS Plus 48 sq. ft. D.E. Pool Filter is designed with a fiberglass-reinforced polypropylene tank that enhances durability.
  • Valve sold seperately
  • Chemical-resistant fiberglass-reinforced polypropylene tank for exceptional strength and long life.
  • Attractive almond-colored tank blends into any backyard environment.
  • Easily removable filter grid pack is secured by a single nut to simplify maintenance.
  • Hi Flow manual air relief valve and continuous internal air relief eliminate air buildup from tank to maintain efficient filtration and prevent over-pressurization.
  • Conveniently located 1-1/2" drain for easy and efficient cleanup.
  • Unique internal design ensures optimal filtration and backwashing efficiency for longer runs between cleanings.
  • Compatible with all sanitizing chemicals.
  • Curved vertical grids provide maximum filter surface area for better cleaning.
  • Leakproof plumbing connections.
  • Tension Control clamp for secure tank closure


The Pentair FNS Plus 48 sq. ft. Fiberglass D.E. Pool Filter provides the highest level of filtration. The FNS Plus is capable of filtering out particulate as small as 5 microns. That's the same size as a human red blood cell.

The FNS plus uses a set or grids coated in pool grade diatomaceous earth. The set of grids consists of 7 full grids 24" in length and 1 partial grid 24" in length. The FNS Plus tank is made with fiberglass-reinforced polypropylene that enhances durability and product life. It uses a hi-flow manual air relief valve that eliminates air buildup in the tank rather than having it force back thru the system.

A 1-1/2" drain is used for quick drainage, and a steel tension control clamp rests securely around the tank, a brass barrel nut securely fastens each half tightly together. To remove the FNS Plus requires a minimum of 74" vertical clearance. Before removing the dome lid, it is suggested to backwash the filter to discharge the contaminated DE powder.

Common Questions:

What are the dimensions of the tank?
  • Tank Dimensions: (DxH) 21.5" x 49"
  • Weight: 84 lbs
How much DE do I add?
  • The FNS Plus uses 4.8 lbs of DE.
What is the max GPM flow rate?
  • The max GPM flow rate is 120 GPM.
What does FNS Plus come with?
  • The FNS Plus comes with the tank, steel clamp, air relief valve, and threaded bulk heads.
Does the FNS Plus come with a backwash valve?
  • No. The FNS Plus does not come with a backwash valve. For a multi-port valve option, we suggest item number 261152 for 2" plumbing and 261177 for 1.5" installations. For a side-mount push-pull valve, we suggest item number 263064.
What is the warranty for the FNS Plus?
  • The FNS Plus carries a manufacturer warranty for 60 days.

California Residents WARNING: Cancer and Reproductive Harm -


Diatomaceous Earth (D.E.)
D.E. is a natural substance that captures dust, dirt and debris as small as 5 microns. A D.E. filter system removes body oils, suntan lotions, pollens, dust, and even some bacteria, making your swimming pool a healthier environment.
Low Maintenance
A D.E. Filter maximizes the useful filtration area. A larger filtration area means longer periods between each cleaning, saving you time on pool maintenance and giving you more time to relax and enjoy your pool.
Energy Efficient
D.E. Filter systems cut energy costs by using lower pump pressure and speeds. If properly taken care of and rinsed regularly, they can significantly reduce water use. In addition to cost savings, lower pump pressure can help prolong the life of your pool pump!


Installation Type: Residential
Filtration Area: 48 sq ft
Product Type: Pool Filter
Filter Type: Diatomaceous Earth
Manufacturer: Pentair
Warranty: 1-Year