Frog Serene Mineral Replacement Cartridge + 4 Bromine Cartridges for Hot Tubs up to 600 Gallons

The FROG Serene (formerly Spa FROG) replacement cartridges provide weeks of fantastic hot tub water, compatible with both the Floating and In-Line Systems. FROG Serene is a complete sanitizing system that kills bacteria in two ways, using a low level of bromine and FROG Sanitizing Minerals, giving you peace of mind.

The FROG Sanitizing Minerals reduce bromine use by up to 50%*. This bundle includes 4 Bromine cartridges, which can last up to 4 weeks depending on the size and usage of your hot tub, making them ideal for a 600-gallon hot tub.

The bundle also includes 1 FROG Sanitizing Mineral Cartridge, which lasts for 4 months. These minerals kill bacteria, condition the water for softness, and absorb acids, making the water feel much more comfortable.

The Prefilled Cartridges mean no touching or measuring of bromine, eliminating any mess, guesswork, or stress. With the FROG Serene system, you can enjoy weeks and weeks of ahhmazing hot tub water without the hassle of traditional water treatment methods.

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