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

Pool Filter Cartridges 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 it’s time to replace the cartridge, it’s 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.