Frog @Ease 3-Pack SmartChlor Replacement Cartridges for Bullfrog Spas

Description Frog @Ease for Bullfrog Spas 3-Pack SmartChlor Cartridges Includes: 3 prefilled SmartChlor Cartridges that lasts 3-4 weeks each Benefits Adjusts up to 600 gallons uses up to 75% less chlorine Only shock once a month No measuring or handling chemicals Notes: Fits with Bullfrog Spas that have two cartridges only. A cartridge holder must be purchases separately if your spa does not have one. It is not included. A Santizing System box is sold seperately with the blue mineral cartridge that lasts up to 4 months. One box of each lasts approximately 4 months total.