Cartridges for Hot Tub Maintenance: FROG Serene Mineral and Bromine Replacement Cartridges are designed for FROG Serene Floating System; includes one replacement mineral cartridge and four replacement bromine cartridges

Innovative Technology for Clean Water: FROG Serene combines our patented mineral formula with a low level of bromine to create clean, silky soft Fresh Mineral Water in your hot tub

Long-Lasting Performance: FROG Serene mineral cartridge lasts four months and each bromine cartridge lasts 2 to 4 weeks; prefilled FROG cartridges simplify the maintenance of your hot tub

Hot Tub Sanitization: With FROG Serene, you use up to 50%* less bromine, making the water easier on skin, swimsuits and your hot tub?s surfaces; slow dissolving bromine creates far less odors than traditional chlorine

Water 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