Unicel C-4325 Replacement Filter for Hayward CX225RE | 25 Sq. Ft.

Overview

The Unicel C-4325 is a pleated polyester cartridge filter element rated at 25.0 sq ft of effective filtration area, constructed for direct OEM replacement service in Hayward Star-Clear cartridge filter housings. Media specification: Reemay nonwoven polyester at 15-micron nominal filtration efficiency, supported on a Schedule-40 PVC pipe core with ABS injection-molded end caps in a closed-bottom, open-top configuration. Dimensional specifications: 4.9375-inch OD, 2.125-inch ID, 9.75-inch overall length. End cap tolerance held within ±0.030 inch on OD for bypass-free seating against housing top and bottom seats. Operating range: 8–25 PSI continuous service at temperatures up to 104°F, consistent with residential pool circulation system parameters and Hayward Star-Clear pump head curve matching at standard turnover rates.

Service interval recommendation: rinse every 4–6 weeks under standard residential bather load, or at ΔP ≥ 8 PSI above clean-filter operating baseline. Chemical soak (TSP or enzyme cleaner) every 3–6 months; replace annually or at first indication of fabric channeling, pleat collapse, or end cap separation. Acid wash with muriatic at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, thorough fresh-water rinse before reinstallation); ABS end cap construction tolerates standard acid wash procedure without adhesive degradation. Chlorine tolerance: continuous service at ≤ 10 ppm free available chlorine; bromine compatible without restriction. Post-installation, verify housing pressure differential against clean baseline and inspect for bypass indicators within the first 24 service hours. Standard Unicel 90-day manufacturer defect warranty applies through authorized trade distribution.

What's Included

Your order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.