Unicel C-6900 Replacement DE Filter Cartridge | 25 Sq. Ft.

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25 Sq. Ft. Replacement DE Filter Cartridge for Quad-Style Systems The Unicel C-6900 is a precision-engineered replacement DE filter cartridge delivering 25 sq. ft. of filtration ar ea via 42-pleat, 8 oz. DE filter fabric construction. Designed for quad-element DE filter systems, this individual cartridge restores your filter's performance when one element needs replacement — without pulling the full set. ⚠️ IMPORTANT: Full Filter Service Requires 4 Cartridges Your Pentair Quad DE 100 requires 4 cartridges for a complete service. Replacing all cartridges at the same time ensures consistent flow, balanced filtration, and full filter efficiency. Add 4 units to your cart to complete your filter service. Specifications Filter Area 25 sq. ft. Length 32 3/4" Outer Diameter 6 1/4" Top Inner Diameter 3" Bottom Inner Diameter 3" Material 8 oz. DE Pleat Count 42 Top Cap: open w/ molded gasket Bottom Cap: open w/ molded gasket Fits into: OEM Brand Product Name Part Number Notes Pentair Quad DE 100 178656 Requires four (4) cartridges for complete system (This is not an exhaustive list.) Pro Tip: Always verify your system's element count before ordering. Measure your existing cartridge — length, outer diameter, and inner diameter — against the specifications above to confirm proper fit. For a complete filter service, replace all elements simultaneously to maintain balanced flow and peak filtration efficiency. Also known as: C6900 Show more