Cartridges for Hot Tub Maintenance: FROG Serene Bromine Replacement Cartridges are designed for the FROG Serene Floating System

Enhanced Sanitation with Bromine Cartridges: These cartridges sanitize the water along with FROG Sanitizing Minerals
Long-Lasting Cartridge Use: Each FROG Serene Bromine Cartridge lasts 2 to 4 weeks, and when used with FROG Minerals, reduces bromine use by up to 50%*; once the cartridges are empty, you can recycle them

Support Cleaner Hot Tub Water: Our FROG Serene Bromine Replacement Cartridges support cleaner and clearer water, making the hot tub water easier on skin, swimsuits and your hot tub?s surfaces

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