Unicel 7000 Series 75 sq. ft. Replacement Filter Cartridge for Caldera Spas | C-7375

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The Unicel C-7375 is a 7000 Series 75 sq. ft. replacement filter cartridge engineered specifically for Caldera Spas. Built with 216 pleats of 3 oz. Reemay 2033 polyester media and a precision-formed 7" outer diameter, it delivers the filtration area and dimensional accuracy that Caldera filter housings require. The semi-circular handle top and open bottom with 2-11/16" inner diameter match the OEM geometry exactly — so it drops in cleanly and seals properly every time. ⚠️ IMPORTANT: Verify Your Bottom Opening Before Ordering The C-7375 has a 2-11/16" bottom inner diameter. It is frequently confused with the Unicel C-7479, which has the same 7" OD and 14-3/4" length but a larger 3" bottom opening. These two filters are not interchangeable. Measure your existing filter's bottom inner diameter before ordering to confirm the correct fit. ⚠️ IMPORTANT: Confirm Quantity Needed for Your Spa Some Caldera Spa models use more than one filter cartridge per full service. Check your owner's manual or count the cartridges currently installed in your spa before ordering to ensure you receive the correct quantity. Specifications Filter Area 75 sq. ft. Length 14 3/4" Outer Diameter 7" Top Inner Diameter N/A Bottom Inner Diameter 2 11/16" Material 3 oz. Reemay 2033 Pleat Count 216 Top Cap: semi-circular handle Bottom Cap: open Fits into: OEM Brand Product Name Part Number Notes Caldera Spas — 1019301, 73531 Verify model and quantity against your owner's manual (This is not an exhaustive list.) Also known as: C7375 Show more