Caldera 31489 | 30 sq ft Spa Filter Cartridge Brand_Pool Marvel unthreaded collar that seals by

unthreaded collar that seals by close tolerance against a matching socket in the filter well

swimmers can jump back in the pool in just 15 minutes after treatment

The result is soft water with much less odor

shake shingle siding) so cap is not imbedded in the siding

Caldera 31489 | 30 sq ft Spa Filter Cartridge Brand_Pool Marvel unthreaded collar that seals byThe 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