Comprehensive Sanitization Kit: Includes FROG @ease Floating Sanitizing System, three additional SmartChlor Cartridges and three packs of FROG Maintain non-chlorine shock provides a complete 4-month solution for maintaining your hot tub’s water qualityHot Tub Sanitizing System: The FROG @ease Floating System floats when working, flips when empty its perfect for hot tubs up to 600 gallons replace the Mineral Cartridge only once every four months and each SmartChlor Cartridge every 3 to 4 weeksInnovative Technology for Clean Water: FROG @ease combines our patented mineral formula with SmartChlor Technology to create clean, silky soft Fresh Mineral Water in your hot tubEasy Hot Tub Maintenance: FROG @ease self-regulates for continuous crystal clear water and eliminates the peaks and valleys of traditional sanitizing methods easily check when a SmartChlor Cartridge replacement is needed with the one color match on the included FROG @ease Test StripsWater Care Expertise: FROG has more than 25 years of experience making water care easier & keeping pool, hot tub and swim spa water sanitized FROG's patented Mineral Technology and prefilled cartridges create cleaner, clearer, softer water