FROG @Ease Replacement SmartChlor Cartridge 3 Pack with Total Alkalinity Increaser & 1 Pack of Maintain for use with Hot Tub FROG @Ease Floating SystemBrand: FROG Features: Replacement Cartridge Pack: Includes 1 FROG TArget Total Alkalinity Increaser, 1 FROG Maintain Shock and 3 SmartChlor Cartridges for use with the FROG Mineral Cartridge for complete water care that supports continuous hot tub treatment Self Regulating Water Treatment: SmartChlor Cartridges require no maintenance or monitoring; each cartridge lasts 3 to 4 weeks depending on the size of your tub and how often it is used Cartridges