Unicel C-8409 90 sq ft Pool Filter Cartridge — 174 Pleats, Compatible with Hayward, Sta-Rite & Waterway

Overview

The Unicel C-8409 is a replacement pool filter cartridge designed to keep your water clear by intercepting debris through a wide filtration area. It features 90 square feet of media and 174 pleats, offering substantial surface area to treat pool water as it passes through.

Filtration performance

With a 4-ounce basis weight media and 100% polyester Reemay construction, the cartridge balances dirt-holding capacity with cleanability and durability, while offering good chemical resistance. Debris capture is noted at roughly 20 microns on average, depending on system conditions.

• Sharp, uniform pleat folds maximize water flow and minimize pressure loss, helping the filter surface work efficiently.
• Large surface area supports more debris hold without immediate clogging, aiding maintenance intervals.

Design and installation

The end-cap design provides a 4-inch inner diameter (ID) with an open configuration and molded gasket for easier removal and replacement. The cartridge body uses durable plastic resistant to common pool chemicals.

• End caps and gasket simplify swapping cartridges in standard housings.
• Made from durable polyester media, the cartridge is built to withstand routine chlorine exposure and cleaning cycles.

Fitment and dimensions

Designed to fit Hayward Pool Products, Sta-Rite, and Waterway systems, it matches common filter housings with an outer diameter of 8-15/16 inches and a length of 17-3/8 inches.

Real-world use and maintenance tips

In everyday pool care, this cartridge supports clearer water between cleanings, especially after busy weekends or seasonal use. For best results, follow your filter housing’s maintenance schedule and monitor system pressure to decide when to replace.