Spa Frog Serene® Bromine Combined Cartridge Kit

Spa Frog Serene® Bromine Combined Cartridge Kit. For use with the Spa Frog Serene In-Line or Floating Cartridge system for hot tubs and spas.   This kit includes:• 1 Blue Mineral Cartridge• 3 Yellow 5.3 oz Bromine CartridgesNot sure how to maintain or start up your hot tub on this system? Download the Spa Frog Serene® In-Line System operating instructions here.Download the Spa Frog Serene® Floating System operating instructions here.