Unicel C-7633 Replacement Filter for Pentair CF-33

Overview

The Unicel C-7633 is a pleated polyester cartridge filter element rated for residential and light commercial pool applications, providing 33 sq ft of filtration area via Reemay nonwoven polyester media. Dimensional specifications: 5.0-inch OD, 2.125-inch ID, 12.625-inch length, with closed-bottom and open-flow top configuration. End caps are ABS injection-molded; core construction is 2.125-inch Schedule-40 PVC pipe providing axial rigidity throughout the rated pressure range. Nominal filtration efficiency is 20 microns under standard test conditions; rated flow capacity is 33 GPM at clean operating differential. The element is rated for continuous service to 104°F and operating pressures to 50 PSI, suitable for matched-pump systems with full-flow turnover requirements in the 33,000–40,000-gallon volume range.

Service interval recommendation: residential installations — pressure-differential-based replacement triggered at ΔP ≥ 8–10 PSI above clean-filter operating baseline, or annual calendar cycle, whichever occurs first. Rinse cycle every 4–6 weeks; chemical soak with TSP or enzyme cleaner every 3–6 months to remove oils, surfactants, and organic loading that resist water rinsing. Verify housing O-ring condition and lubricate with silicone-based O-ring grease at each service interval; confirm post-installation pressure reading against documented clean baseline to validate seating. Chemical compatibility: polyester media tolerates continuous service at ≤ 10 ppm free available chlorine; muriatic acid soak (1:20 dilution, 20-minute maximum exposure) compatible for calcium scale removal; enzyme cleaners compatible without restriction. ABS end cap construction is compatible with standard acid wash procedures. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution channels.

What's Included

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