FROG Serene Replacement Bromine Cartridges for use with Hot Tub FROG Serene Floating Sanitizing System with 50 Test Strips - Prefilled for Quick & Easy Hot Tub Maintenance - 4 Pack

Cartridges for Hot Tub Maintenance: FROG Serene Bromine Replacement Cartridges are designed for the FROG Serene Floating System, included test strips indicate the ideal bromine level in your hot tub...