FROG @Ease Floating System for Hot Tubs - Quick & Easy Self-Regulating Hot Tub Sanitizer - Hot Tub Maintenance System with Sanitizing Minerals & SmartChlor Technology - Starter BundleBrand: FROG Features: Hot Tub Sanitizing System: 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 the SmartChlor Cartridge every 3 to 4 weeks Innovative 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 tub Effective