Unicel 4CH-30 Replacement Filter for LA Spas PTL25P4 (11-7 | 30 Sq. Ft.

Overview

The Unicel 4CH-30 is a pleated polyester spa cartridge filter element providing 30.0 sq ft of filtration area in a compact, threaded-base configuration engineered for top-load spa filter housings. Dimensional specifications: 4-15/16-inch OD, 11-7/8-inch overall length, with a molded ABS bottom end cap featuring an integrated 1-1/2-inch MPT (male pipe thread) connection and a closed top handle end cap for single-point service removal. Media construction is Reemay-spec nonwoven polyester at nominal 20-micron filtration efficiency, supported on a structural PVC core with UV-stabilized end cap adhesive rated for continuous service at temperatures up to 115°F. Operating pressure range: 5–15 PSI typical for spa circulation pump applications, with end cap bond integrity verified through standard ASTM shear testing at elevated temperature.

Service interval recommendation for spa applications: rinse with fresh water every 2–4 weeks; chemical soak in dilute TSP or commercial enzyme cleaner every 4–6 weeks to remove accumulated body oils, lotions, and surfactant residue that resist standard rinsing. Replace at 12-month intervals under typical residential spa duty cycles, or earlier if ΔP rises ≥ 5 PSI above clean operating baseline, if visible pleat collapse or fabric channeling is observed, or if thread integrity at the ABS base shows wear. Chemical compatibility: polyester media tolerates continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale remediation (20-minute maximum exposure, followed by thorough fresh-water rinse). Enzyme cleaners compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution channels.

What's Included

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