FROG Serene Mineral Replacement Cartridge plus 4 Bromine Cartridges for use with FROG Serene Floating Sanitizing Spa System or Hot Tubs with the FROG Inline Cartridge System

FROG Serene Replacement bundle for the FROG Serene Floating System or FROG Inline System (an approximate 4-month supply).   This Value Pack includes: • 1 FROG Sanitizing Mineral Cartridge (lasts approximately 4 months) • 4 Bromine Cartridges (last up to 4 weeks each) • Free Shipping within the contiguous 48 States Say goodbye to complicated hot tub maintenance and hello to crystal-clear, fresh mineral water.   Compatible with the FROG Serene Floating System for spas up to 600 gallons or Frog Inline Cartridge Systems.  This FROG Serene Mineral Refill Cartridge bundle delivers everything you need for months of effortless spa care, combining the power of natural minerals with a very low level of bromine to kill bacteria in 2 ways.   The Science of Serene Water Unlike traditional chlorine sanitizers, FROG Serene allows you to set it and forget it for weeks at a time. The innovative dual-action system harnesses the natural power of minerals to eliminate contaminants while using up to 50% l