Unicel UHD-SR137 Replacement Filter for Sta-Rite WC108-70S2X | 137 Sq. Ft.

Overview

The Unicel UHD-SR137 is a heavy-duty pleated polyester cartridge filter element engineered for high-capacity residential and light commercial pool filtration, delivering 137 sq ft of effective filtration area through a densely pleated Reemay nonwoven polyester media pack. Construction features molded end caps designed for bypass-free seating in Sta-Rite and Pentair filter housings, with a reinforced internal core specified to maintain pleat geometry under sustained operating differential pressures up to 25 PSI. Nominal media filtration efficiency is rated in the 15–20 micron range under standard test conditions. The element is rated for continuous service at water temperatures up to 104°F and is engineered to match OEM dimensional tolerances within ±0.030 inch on critical end cap diameters, ensuring positive sealing at top and bottom manifold seats in the WC108-70S2X housing geometry.

Service interval recommendation: residential and light commercial installations — replacement triggered at ΔP ≥ 8–10 PSI above documented clean-filter operating baseline, or on a 12-month calendar cycle, whichever occurs first. Interim rinse maintenance at 4–6 week intervals or earlier if ΔP exceeds 5 PSI above baseline; quarterly chemical soak with dilute TSP or enzyme cleaner is recommended to remove accumulated oils, surfactants, and organic loading that water rinse alone will not clear. For calcium carbonate scale, muriatic acid soak at 1:20 dilution is compatible with the ABS end cap construction (20-minute maximum exposure, thorough rinse before reinstallation); limit to one acid treatment per service season. Polyester media tolerates continuous service at ≤ 10 ppm free available chlorine and standard bromine sanitization regimes; enzyme cleaner compatible without restriction. Verify housing O-ring condition and lubricate with silicone-based O-ring grease at each element change; perform post-installation pressure verification to confirm clean baseline before returning the system to service. Standard Unicel 90-day manufacturer's 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.