FROG Serene Mineral Replacement Cartridge + 4 Bromine Cartridges for Hot Tubs, for only with FROG Serene Floating Sanitizing System for Spas up to 600 gallons, Quick and Easy Hot Tub Sanitizer

FROG Serene (formerly Spa FROG) replacement cartridges give you weeks and weeks of ahhmazing hot tub water, fit the Floating or In-Line System FROG Serene is a complete sanitizing system that kills bacteria with a low level of bromine and FROG Sanitizing Minerals - giving you peace of mind FROG Sanitizing Minerals reduce bromine up to 50%*; this bundle includes 4 Bromine cartridges for weeks of ahhmazing hot tub water, which last up to 4 weeks depending hot tub size and usage; ideal for 600 gallon hot tub. *Compared to the minimum ANSI recommended bromine level of 2.0 ppm for a hot tub. This bundle includes 1 FROG Sanitizing Mineral Cartridge, which lasts 4 months; minerals sanitize the hot tub, condition the water for softness and absorb acids – water feels much more comfortable Prefilled Cartridges mean no touching or measuring bromine – no mess, no guess, no stress!