Frog @ease In-Line SmartChlor Replacement Chlorine Cartridge 3-Pack for Marquis Spas Caldera Spas Artesian Spas and Hot Springs Spas Up to 600

Hot Tub Accessories by FROG. Details: Kills bacteria 2 ways giving you less work and more peace of mind. Cartridges last up to 3 4 weeks depending on hot tub size and usage ideal for hot tubs 600 gallons. When its time to replace the cartridge its a snap. Replacing the prefilled SmartChlor Cartridge is easy simply open the In-Line housing take the spent SmartChlor Cartridge out and pop the new one in. Prefilled cartridges mean no guess no mess and no stress.0 ppm for a hot tub. Water is Cleaner Clearer Softer and Easier to take care of.