Unicel 8CH-951 Replacement Filter for Bullfrog Spas 65-221 | 40 Sq. Ft.

Overview

The Unicel 8CH-951 is a pleated polyester spa cartridge filter element engineered for Bullfrog Spas circulation systems, delivering 40 sq ft of filtration area in a compact high-density pleat configuration with a 2-inch SAE threaded bottom port for direct standpipe engagement. Media construction is Reemay-grade nonwoven polyester at nominal 20-micron filtration efficiency, supported on a structural inner core suitable for sustained spa-side pressure cycling. End cap construction utilizes molded ABS with the lower cap configured as a 2-inch SAE male threaded fitting, and the upper cap closed for top-down installation in single-cartridge spa manifolds. The element is rated for continuous service to 115°F with intermittent excursions to 120°F, consistent with manufacturer-specified spa operating envelopes. The 40 sq ft media area provides extended dirt-holding capacity and reduced service frequency relative to standard 25–35 sq ft spa elements operating under equivalent bather loads.

Service interval recommendation for spa applications: fresh-water rinse every 2–4 weeks and chemical soak with dilute TSP or enzyme cleaner every 4–6 weeks to remove cosmetic oils, surfactants, and biofilm precursors that resist mechanical rinsing. Replacement is recommended at 12-month intervals under typical residential spa use, or earlier when ΔP rises ≥ 5 PSI above clean operating baseline, or upon visual inspection failure (pleat collapse, fabric tear, end cap separation, or thread damage at the SAE fitting). Chemical compatibility: polyester media and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution (20-minute maximum exposure) is compatible for calcium scale remediation, followed by thorough fresh-water rinse before reinstallation. Hand-tighten the SAE fitting only — do not apply pipe wrench or supplemental thread sealant. Standard Unicel 90-day manufacturer defect warranty applies through authorized distrib

What's Included

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