Bromine is used as a chlorine replacement with this system. FROG Serene works by killing bacteria in two ways: with sanitizing minerals and a very low level of bromine giving you the serene feeling you’re looking for. The yellow and blue cartridges lock into the green holder to float around your spa releasing ions as needed. Instead of adding bromine daily, you simply replace a pre-filled cartridge about once a month.
Kit includes:
- 1 bromine cartridge
- 1 mineral cartridge
- 1 bottle of test strips
- 1 “JumpStart” chlorine package
- 1 cartridge holder
