Product Overview

The Pentair FNS Plus 48 D.E. Filter (Model 180008) delivers exceptional water clarity using Diatomaceous Earth (D.E.) filtration, one of the most effective filtration methods available for swimming pools. With 48 sq. ft. of filtration area and a maximum flow rate of 96 GPM, this high-performance filter cleans pool water down to microscopic levels—removing particles as small as 5 microns.

Constructed with a durable fiberglass-reinforced tank and equipped with service-friendly features, the FNS Plus 48 provides reliable, long-lasting performance for residential pools up to 69,120 gallons. This filter is ideal for pool owners demanding superior clarity, efficient operation, and low-maintenance serviceability.

Ideal For

In-ground pools up to 69,120 gallons

Pool owners seeking crystal-clear water with D.E. precision

Upgrades from sand or cartridge filtration systems

Installations requiring high flow rates and premium performance

Pools using Pentair pumps and automation systems

Key Features

48 sq. ft. D.E. Filtration: Removes particles down to 5 microns for unmatched water clarity.

High Flow Capacity: Handles up to 96 GPM, making it suitable for high-performance systems.

Fiberglass-Reinforced Tank: Corrosion-proof, UV-resistant construction built for long service life.

Easy Service Clamp: Quick-release, stainless-steel clamp provides fast, tool-free access for cleaning and maintenance.

Balanced Flow Design: Prevents channeling and maximizes D.E. grid performance.

Built-In High Flow Manual Air Relief: Ensures safe, efficient operation and easy start-up.

Low Maintenance: Long grid cycles reduce the frequency of cleanings.

Pentair Reliability: Engineered with professional-grade materials and precision craftsmanship.

Benefits

Superior Water Clarity: D.E. filtration delivers the cleanest, clearest water of any filter type.

Efficient & Effective: High surface area maximizes filtration while reducing run times.

Durable Construction: Fiberglass tank resists corrosion, pressure, and harsh outdoor conditions.

Easy Cleaning & Maintenance: Clamp-access design simplifies D.E. grid servicing.

Optimized Flow: Works seamlessly with high-efficiency pumps for enhanced circulation.

Specifications

Customer-Facing Q&A

Q: What size pool is this filter rated for?
A: The FNS Plus 48 is designed for pools up to 69,120 gallons.

Q: How often do I need to recharge the D.E. powder?
A: After each backwash or cleaning cycle, D.E. powder must be added according to the manufacturer’s recommended amount.

Q: Does this filter come with a multiport valve?
A: No. Valves are sold separately, allowing you to select the configuration that best suits your plumbing.

Q: Is this compatible with saltwater pools?
A: Yes. The fiberglass and internal components are corrosion-resistant and safe for saltwater pool systems.

Q: How fine does this filter clean?
A: D.E. filters remove particles as small as 5 microns, offering the clearest water of any filtration technology.