Caldera 31489 | 30 sq ft Spa Filter Cartridge Brand_Pool Marvel The result is soft water

The result is soft water with much less odor

A single 16 oz bottle treats a standard spa cover roughly 12 to 16 times — about a year and a half of monthly maintenance

or on any surface where dissolved metals such as iron

Sundance® Spas 6541-397S Complete Filter Series 880

Caldera 31489 | 30 sq ft Spa Filter Cartridge Brand_Pool Marvel The result is soft waterThe Caldera 31489 filter cartridge delivers 30 square feet of pleated filtration for cleaner, clearer spa water. It's one of the most widely compatible cartridges in the Watkins family of spa brands, serving a broad range of models across decades of production so it's a dependable replacement to keep on hand. Filtration is the quiet backbone of good spa water. Every soak leaves behind body oils, lotions, hair, and fine debris, and the cartridge is