Includes: 1 Blue FROG Serene Mineral Cartridge, which lasts 4 months; minerals eliminates organic contaminants, condition the water for softness and absorb acids – water feels much more comfortable

For use in FROG Serene (formerly Spa FROG) Floating System or In-Line System with the Yellow Bromine Cartridge (sold separately); FROG Serene eliminates organic contaminants 2 ways with a low level of bromine and FROG Sanitizing Minerals

The FROG Serene Fresh Mineral Water hot tub system uses Bromine and Mineral Cartridges that work together to eliminates organic contaminants 2 ways, reduce bromine use up to 50%* and improve the overall quality of hot tub water

You use less bromine, making water easier on skin, hair, swimsuits, and your hot tub’s surfaces. FROG Sanitizing Minerals condition the water for softness and absorb acid to help keep pH balanced

The Bromine Cartridge can be dialed in to meet your hot tub’s precise needs and is designed to last 2-4 weeks per cartridge. It’s prefilled, making replacement quick and easy, plus it’s recyclable when empty

Unlike chlorine, bromine slowly dissolves in hot water so it’s easier to regulate, has far less odors and is less impacted by pH swings making sanitizing more effective. Say goodbye to constant monitoring. The Mineral Cartridge must be replaced every 4 months to effectively sanitize the hot tub, it works with the Bromine Cartridge to eliminates organic contaminants 2 ways.