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Sundance® Spas 6473 453S MicroClean Ultra II Inner Filter 880 Series Type_Chlorine Scale buildup is also prevented Scale buildup is also prevented to ensure your pump and heater are working at peak efficiency hands off chlorine generation — which conveniently matches the manufacturer recommended annual drain and refill interval for a saltwater spa Fitment Note: Inner cartridge only Sundance® Spas 6473 453S MicroClean Ultra II Inner Filter 880 Series
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