Unicel C-7479 | 75 sq ft Caldera Spa Filter Brand_Oreq This cartridge uses a 2

This cartridge uses a 2 inch SAE (buttress) thread

Each Serene bromine cartridge lasts 2–4 weeks

Matching that fitting style matters more than matching square footage: a cartridge with the right filtration area but the wrong bottom connection won't seal

and once they're there they can stain the shell with stubborn discoloration

Unicel C-7479 | 75 sq ft Caldera Spa Filter Brand_Oreq This cartridge uses a 2The Unicel C 7479 delivers 75 square feet of filtration across 216 pleats of Reemay 2033 polyester media. Built to meet or exceed OEM specifications, it's the replacement cartridge for Caldera Spas models using OEM part 033017. 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