Caldera 73531 | 75 sq ft Utopia Spa Filter Brand_Quadra-Fire and Enhanced Shock is a

and Enhanced Shock is a cornerstone of a simple

Same powerful chemistry as the 5 lb economy bucket — 99% sodium dichloro-s-triazinetrione dihydrate delivering 55% available chlorine — packaged in a smaller bottle that's ideal for new chlorine-program owners

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you have the newer version and need part 73722 instead

Caldera 73531 | 75 sq ft Utopia Spa Filter Brand_Quadra-Fire and Enhanced Shock is aThe Caldera 73531 filter cartridge is a factory original replacement covering a wide range of Caldera spas. With 75 square feet of filtration across 260 pleats of heavy duty polyester, it delivers more efficient filtration and better water clarity so you spend less time cleaning and more time enjoying your hot tub. Filtration is the quiet backbone of good spa water. Every soak leaves behind body oils, lotions, hair, and fine debris, and the cartridge