Unicel C-9481 – 120 sq ft Replacement Cartridge Filter Product Overview The Unicel C-9481 is a high-capacity replacement cartridge filter designed for spa and pool filter systems that originally used a 120 sq ft cartridge element. It features up to approximately 218 pleats and delivers efficient filtration and longer intervals between cleanings. Key Features Approximately 120 sq ft of pleated media area. Durable spun-bonded polyester media for extended service life. Compatible with filter housings that call for C-9481 or equivalents (e.g., Jacuzzi Brothers Sherlock 120, etc.). Drop-in replacement – no modifications required when replacing a worn cartridge of the same size. Technical Specifications Part Number: C-9481 Media Area: ~120 sq ft Pleat Count: Approx. 218 pleats Diameter: ~10″ outer diameter Length: ~20-1/16″ (approx) Applications & Compatibility This cartridge is suitable for spa and pool filter systems originally equipped with a 120 sq ft cartridge specification. Prior to purchasing, please verify the filter tank’s existing cartridge size, dimensions, and part number to ensure compatibility. Installation Instructions Turn off pump and relieve system pressure before servicing. Remove the old cartridge and inspect the housing interior for debris, damage or worn O-rings. Install the new C-9481 cartridge, making sure it seats correctly and aligns with the manifold or base plate. Close the filter housing, restore circulation and monitor gauge/pressure to ensure proper operation. Troubleshooting High pressure soon after installation: Check return and suction valves, make sure the new cartridge is properly seated and there are no blockages or restricted flows. Cloudy water or low flow: Confirm the cartridge is correctly sized, pleats not compressed, and the filter lid gasket is sealing properly. Leaks at lid or base: Inspect O-rings, gaskets and ensure correct torque and alignment of housing after cartridge install. Maintenance Tip Rinse the cartridge periodically to remove debris and extend life. Use a cartridge cleaner annually as needed. Replace the cartridge when pleats become worn, media damaged or system pressure remains high after cleaning. Regular maintenance ensures longer life and better performance from your filtration system.
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