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Bullfrog spas remain peerless in the hot tub world for their upgradeability. Now that you’ve upgraded to the Frog @ease System for Bullfrog Spas keep your water clear safe and odor free by using genuine Frog @ease refills. The silver @ease SmartChlor refills provide 5-6 weeks of low-chlorine sanitation. Control bacteria algae and odors by simply changing the SmartChlor cartridge monthly and testing your hot tub regularly for pH level and free chlorine. This kit includes three SmartChlor refill cartridges. It does not include a replacement mineral cartridge which is sold separately. SmartChlor works best in combination with fresh mineral sanitizer. At the end of each season consider replacing your blue @ease mineral cartridge by buying a new Frog @ease System for Bullfrog Spas sold separately.