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Product Summary

Pentair FNS Plus D.E. Swimming Pool Filter - 48 Sq.Ft. by Pentair Pool Products
The Pentair FNS Plus D.E. Swimming Pool Filter with 48 Sq.Ft. is a high-performance filtration system with a durable design that provides energy-efficient and reliable performance. Its efficient flow and top manifold ensure clear and sparkling water while its corrosion-resistant grid assembly and heavy-duty tank make maintenance easy. With easy installation and a backwash valve included, this filter is an excellent choice for anyone looking for low-maintenance and efficient pool filtration.

Frequently Purchased Together

Total Price for 2 items $259.98

Product Details

Pentair FNS Plus D.E. Swimming Pool Filter - 48 Sq.Ft.

The Filter That Delivers Crystal Clarity

Filtering with diatomaceous earth (D.E.) gives you water that really sparkles. That's because D.E. filters remove the tiniest of contaminants, particles as small as 5 microns (an average grain of sand is 1,000 microns). Even though these particles can't be seen individually, collectively they greatly affect water clarity. Here's why D.E. filters work so well. Water passes through a series of D.E.-coated grids. Under a microscope, D.E. looks like a collection of tiny sponges. And just like a sponge, water can pass through, but microscopic impurities like dirt, algae and some forms of bacteria can't.

The FNS Plus filters have been designed with curved grids to maximize filtration area. More filter area means better performance and longer periods between cleanings. Our internal design has been refined to minimize flow restrictions and, therefore, requires minimal pumping power to achieve a needed flow rate. That means lower utility costs. In addition to providing the clearest water possible, FNS Plus filters were also designed for easy maintenance and long-term reliability. So, you can count on them to keep your pool's water clean and crystal clear for years to come.

Pentair FNS Plus D.E. Filter Benefits:

  • Curved vertical grids provide maximum filter surface area for greater dirt-trapping capacity and longer periods between cleanings
  • Internal design ensures optimum filtration and backwashing efficiency
  • Chemical-resistant, fiberglass-reinforced polypropylene tank for exceptional strength and longer life
  • Easily removable filter grid pack to simplify maintenance and save you time

The Culmination of 40 Years of Pool Filter Experience

The time-tested design of the FNS Plus filter offers you maximum performance, convenience and reliability for year after year of sparkling-clear pool enjoyment. No wonder more than 2 million Pentair filters have been installed by pool professionals.

  • Attractive, almond-colored tank blends into any backyard environment
  • High Flow Manual Air Relief Valve and continuous internal air relief work together to maintain efficient filtration and will help prevent overpressurization
  • Easily accessible 1 1/2" drain for efficient cleanout

Available Multi-Port Valves (sold separately):

Pentair FNS Plus D.E. Filter Specifications:

  • 1 Year Limited Manufacturer's Warranty
  • D.E. Required: 4.8 lbs. (stock up on D.E. with a 24 lb. Box of SPLASH D.E.
  • Dimensions: 21 1/2" (W) x 49" (H) with (pressure gauge installed)
  • Vertical Clearance Required to Remove Grids: 74" (H)
  • Weight: 80 lbs.

Pentair FNS Plus D.E. Filter Performance Data:

  • Effective Filtration Area: 48 Sq. Ft.
  • Flow Rate: 96 GPM
  • Turnover Capacity in 8 Hours: 46,080 GPH
  • Turnover Capacity in 10 Hours: 57,600 GPH
  • Turnover Capacity in 12 Hours: 69,120 GPH

Product Specifications

Pentair Pool Products Item EC-180008 Documentation and Manuals

Pentair Pool Products Item EC-180008 Suggested Applications

  • All Concrete Pools
  • All Plaster Pools Including Colored, Stone, Glass, & Pebble
  • All Painted Pools
  • All Inground Vinyl Liner Swimming Pools
  • All Aboveground Swimming Pools

Shipping Rates

Orders Under $50 $5.00
Orders Over $50 FREE
3-Day Premium add $50.00
2-Day Premium add $65.00

Shipping Policies:

  • We only ship orders to the 48 contiguous United States.
  • Chemicals, pool paint, and some oversized items, will only ship via ground service.
  • Items shipped via Freight Service, such as pool heaters, will only ship via ground service.
  • All orders shipping to Maryland will incur a 6% sales tax charge.
  • Some items, including hazmat, may require a Direct Signature upon delivery.
  • Shipments must be inspected by customer prior to signing delivery receipt.
  • Orders containing small and light-weight items may ship via FedEx SmartPost or USPS.

Order Returns

You may return an item sold to you by up to 30 days after purchase. The product must be in good condition, unused, in original packaging, and must have all parts, accessories and paperwork; returns without these requirements and/or guidelines will not be accepted.

If a delivery attempt is unsuccessful on order requiring a direct signature, a 15% - 25% re-stock fee may be applied should the order be returned to by the carrier.

Any claims to missing parts, items or damaged goods for any orders must be made within 15 days of delivery date. We are not able to credit your shipping and handling fees if the wrong product was ordered due to customer error. However, if you received the wrong products due to an error on our behalf, we will pay for the return services fees and you will receive a full refund or exchange.

To return an item to, please call 800-4MY-POOL to get a Return Merchandise Authorization number (RMA) and return instructions. Any items returned without an RMA number will be refused. We will process your refund upon receipt of the returned product.

Products that cannot be returned:

  • Pool Chemicals
  • Special Orders
  • Pool Liners
  • Pool Paint

Products that may incur a re-stock fee of 15% - 25%:

  • Pool Cleaners *
  • Pool Heaters *
  • Pool Pumps *
  • Pool Filters *
  • Pool Lights & Fixtures *
  • Pool Ladders & Rails *
  • Pool Slides *
  • Pool Chlorinators *
  • Custom Manufactured Safety Covers
  • Pool & Spa Electronics or Controls *
  • In-Stock Safety Covers
  • Pool Covers that are Ordered and for the Incorrect Pool Size
  • Spa Cover Lifters *
  • Umbrellas & Umbrella Stands, and Hammocks *

* These products must not have been used, installed, or attempted to have been installed. All products must include original paperwork, parts & accessories, and everything accompanied with the product.

Concealed damage on any ground shipment must be reported within 3 business days. Freight shipments must be inspected for damages prior to customer signing delivery receipt. Please email any information regarding concealed damage to Please reference your order number in all order related email correspondence.

Customer is responsible for any/all return shipping charges. Some returns may be subject to a 15% - 25% restock fee that will be deducted from your refund.

Please call 800-4MY-POOL if you have questions regarding this return policy.

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