Cartridges for Hot Tub Maintenance: FROG Serene Replacement Mineral Cartridges are designed for use in the FROG Serene Floating System; deliver superior water treatment for a clean and clear hot tub experience

Enhanced Sanitization with Fresh Minerals: Mineral Cartridges sanitize the water along with FROG Serene Bromine
Long-Lasting Cartridge Use: Each FROG Serene Mineral Cartridge lasts 4 months, so you can enjoy long lasting sanitization; once the cartridge is empty, you can recycle it

Support Cleaner Hot Tub Water: Our FROG Serene Mineral Replacement Cartridges create Fresh Mineral Water, making the hot tub 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