Product Description: For use only in certain hot tub models up to 600 gallons: Artesian Elite, Artesian Island (optional on Artesian Island Elite and South Seas); Marquis Crown (optional on Marquis Elite, Vector and Celebrity); Caldera Vacanza; and Hot Spring Hot Spot The FROG @ease In-Line Sanitizing System includes 1 Mineral Cartridge that lasts 4 months, 1 SmartChlor Cartridge, that lasts up to 4 weeks depending on hot tub size and use, FROG @ease Test Strips, and 1 package FROG Jump Start startup shock Eliminates organic contaminants 2 ways with FROG Sanitizing Minerals that eliminates organic contaminants and SmartChlor – a unique, patented chlorine formula that adds a low level of chlorine only when needed. Say goodbye to constant monitoring You use up to 75% less chlorine* with FROG @ease, making water easier on skin, hair, swimsuits, and your hot tub’s surfaces. FROG sanitizing minerals condition the water for softness, absorb acid to help keep pH balanced You shock only once a month, or when draining and refilling your hot tub – that’s so much easier than shocking after every use – it saves time and the frustration of constant shock treatments