Frog Serene Cartridges

The Frog Serene Cartridge Kit, easy-to-use hot tub sanitation system that combines mineral and low-level bromine technology to keep water clear, soft, and balanced. The kit typically includes one 4-month mineral cartridge and three 2-4 week bromine cartridges, reducing bromine usage by up to 50% for a "no-mess, no-stress" experience.