Unicel C-7350 | 50 sq ft Caldera Spa Filter

The Unicel C-7350 delivers 50 square feet of filtration built on Reemay® polyester media, capturing debris down to an average of 20 microns. Built to meet or exceed OEM specifications, it's the replacement cartridge for new-style Caldera® Spas, taking the place of Caldera parts 73532 and 1019401. Filtration is the quiet backbone of clean spa water. Every soak leaves behind body oils, lotions, hair, and fine debris, and the cartridge is what removes all of it before it clouds the water, feeds bacteria, or coats your plumbing. When a filter is worn or clogged, the effects spread everywhere: dull water, higher chemical use, softer jets, and a pump and heater straining against restricted flow. What separates a Unicel from a bargain cartridge is the media itself. Reemay uses a trilobal fiber — three-lobed in cross-section rather than round — which delivers roughly 45% more surface area than standard rounded filter fibers. More surface means more places to capture dirt and oils, higher dirt-holding capacity, and more time between cleanings. Add a semi-circular handle for easy lifting, a 2-11/16 inch open bottom that seats into the housing, and chemical-resistant end caps, and you get a cartridge built to last. Made in the USA. Pro Tip: This is the "new style" Caldera cartridge — verify yours before ordering. Caldera has used several cartridge designs and sizes across its model years, and this one covers the configuration with a handle on top, a 2-11/16 inch open bottom, and a 7 by 10-3/4 inch body. If the numbers 73532 or 1019401 appear on your current filter, you're in the right place. Brand UNICEL®