Unicel 8CH-951 Replacement Filter Cartridge | 40 sq. ft. | Bullfrog Spas

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The Unicel 8000 Series 8CH-951 delivers 40 sq. ft. of filtration surface — a genuine upgrade over the original Bullfrog Spas Oct-70 cartridge (rated at 35 sq. ft.) — packed into 24 4 precision pleats of 3 oz. Reemay 2033 polyester media. The result is improved water clarity and extended service intervals without changing your hardware. ⚠️ IMPORTANT: Full Filter Service May Require 2 Cartridges Many Bullfrog Spa models use a dual-filter system requiring 2 cartridges for a complete service. Replacing only one while leaving a worn cartridge in place reduces overall filtration efficiency. Check your existing filter setup and add 2 units to your cart if your spa has two filter housings. ⚠️ NOTE: Also Replaces Older Bullfrog 6" OAL Filter Element The 8CH-951 is also the correct replacement for the older Bullfrog filter element with a 6" overall length and shorter threaded end. If your existing cartridge measures approximately 6" tip-to-tip, this is still the right part. Specifications Filter Area 40 sq. ft. Length 5 3/4" Outer Diameter 8" Top Inner Diameter N/A Bottom Inner Diameter N/A Material 3 oz. Reemay 2033 Pleat Count 244 Top Cap: semi-circular handle Bottom Cap: 2" SAE thread Fits Into: OEM Brand Product Name Part Number Notes Bullfrog Spas 40 sq. ft. Top Load Oct-70 Original cartridge rated at 35 sq. ft. — Unicel 8CH-951 provides 40 sq. ft. Also replaces Bullfrog 6" OAL filter element with shorter threaded end. (This is not an exhaustive list.) Show more