Unicel 75 Sqf 3 oz NS Caldera Cartridge Element | C-7375

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Product Overview The Unicel C-7375 Replacement Filter Cartridge is a 75 sq. ft. spa filter cartridge designed for select Caldera Spas using the newer-style 75 sq. ft. cartridge. Bu ilt with high-quality polyester filter media, this cartridge helps capture dirt, oils, debris, and fine particles to keep spa water cleaner and clearer. This replacement cartridge is commonly used as an OEM-style replacement for Caldera spa part numbers 1019301 and 73531. It features a semi-circular handle top and an open bottom with a 2-11/16 in. inside diameter. Ideal For Caldera Spas using new-style 75 sq. ft. cartridgesReplacing worn or dirty spa filtersImproving spa water clarityRoutine hot tub maintenanceReducing debris in spa waterSpa service techniciansResidential spa owners Key Features 75 sq. ft. replacement spa filter cartridgeDesigned for select Caldera Spa modelsReplaces Caldera part numbers 1019301 and 73531Compatible cross-reference for Pleatco PCD75N and Filbur FC-39647 in. outside diameter14-3/4 in. lengthSemi-circular handle topOpen bottom with 2-11/16 in. inside diameter216 pleats for strong filtration capacity3 oz Reemay 2033 polyester filter mediaHelps capture dirt, oils, debris, and fine particlesDrop-in replacement for compatible spa filter housings Benefits The Unicel C-7375 helps maintain clean and clear spa water by trapping debris and contaminants as water circulates through the filter system. Replacing an old or clogged filter cartridge can improve water flow, reduce strain on the spa pump, and make chemical maintenance easier. Its 75 sq. ft. filtration area and 216-pleat design provide strong debris-holding capacity for compatible Caldera spa systems. The semi-circular handle makes cartridge removal easier during cleaning and replacement. Specifications Specification Details Brand Unicel Product Type Spa Filter Cartridge Product Name Replacement Filter Cartridge for 75 sf Caldera Spa SKU C-7375 Manufacturer Part Number C-7375 / C7375 Filter Area 75 sq. ft. Outside Diameter 7 in. Length 14-3/4 in. Top End Cap Semi-Circular Handle Top Opening Closed / Handle Top Bottom End Cap Open Bottom Inside Diameter 2-11/16 in. Pleat Count 216 Filter Media 3 oz Reemay 2033 Polyester Compatible Spa Brand Select Caldera Spas OEM Cross Reference Caldera 1019301, 73531 Replacement Cross References Pleatco PCD75N, Filbur FC-3964 Application Spa and hot tub filtration Sold As Single cartridge Barcode 090164769646 Customer-Facing Q&A What does the Unicel C-7375 fit?The C-7375 fits select Caldera Spas that use the newer-style 75 sq. ft. filter cartridge, including replacements for Caldera part numbers 1019301 and 73531. What are the dimensions?This cartridge measures 7 in. outside diameter by 14-3/4 in. long, with a semi-circular handle top and a 2-11/16 in. open bottom. Is this the same as Pleatco PCD75N?Yes. The Unicel C-7375 is commonly cross-referenced with Pleatco PCD75N and Filbur FC-3964. Is this for pools or spas?This is a spa and hot tub filter cartridge, commonly used with compatible Caldera spa models. How often should I replace this cartridge?Replacement timing depends on spa usage, water care, and cleaning frequency. Replace the cartridge when it is damaged, heavily stained, clogged, has collapsed pleats, or no longer restores water flow after cleaning. Can I order based only on the spa brand?No. Always confirm the cartridge dimensions, bottom opening size, top style, and existing part number before ordering. Caldera has used different filter styles across different models and years. Confirm Before Ordering Confirm the following before purchasing: Filter area: 75 sq. ft.Outside diameter: 7 in.Length: 14-3/4 in.Top style: Semi-circular handleBottom style: OpenBottom inside diameter: 2-11/16 in.OEM cross-reference: Caldera 1019301 / 73531Compatible cross-reference: Pleatco PCD75N / Filbur FC-3964 Do not order based on spa brand alone. Filter cartridge compatibility depends on exact dimensions, end cap style, bottom opening size, and OEM part number. Show more