Unicel C-4625 Replacement Filter for Rainbow 17-2327 | 25 Sq. Ft.

Overview

The Unicel C-4625 is a pleated polyester spa cartridge filter element providing 25.0 sq ft of filtration area in a 4-15/16-inch OD, 2-1/8-inch ID, 8-inch length form factor with a closed-bottom, open-top end-cap configuration. Media construction utilizes Reemay nonwoven spunbond polyester at a 20-micron nominal filtration threshold, supported by a PVC core for axial rigidity under spa-pump operating pressures (typical 5–15 PSI). End caps are ABS injection-molded with UV- and chemical-stabilized bond adhesive rated for continuous service at 104°F and intermittent excursions to 115°F. Pleat geometry is optimized for 25 GPM sustained throughput at minimum clean-pressure differential, delivering high dirt-holding capacity per cycle in residential spa and threaded-port in-line cartridge housings.

Service-interval recommendation for spa duty: fresh-water rinse every 2–4 weeks; chemical soak in dilute TSP or enzyme degreaser every 4–6 weeks to remove body oils, lotions, and surfactant residue that resist mechanical rinsing. Replace the cartridge at ΔP ≥ 5 PSI above clean-filter baseline, or at 12-month maximum service age for continuous-use spas — whichever occurs first. Chemical compatibility: continuous operation at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid wash compatible at 1:20 dilution (20-minute maximum soak) for calcium scale remediation, followed by full neutralizing rinse before reinstallation. Verify O-ring seating and confirm post-installation operating pressure against the clean baseline before returning the system to service. Standard 90-day Unicel manufacturing defect warranty applies through authorized distribution.

What's Included

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