Bromine Spa Frog
If you have a Spa Frog In-Line System built into your spa you simply open the cap on the side of your tub, pull up the holder and snap in one Spa Frog conditioning cartridge and one bromine cartridge or it can be used with a Spa Frog Floating Dispenser.
Use with the Spa Frog conditioning cartridge - Spa Frog Conditioning Cartridge (Mineral Cartridge)
The conditioning cartridge will last approximately 3 - 4 months and the bromine cartridge 2-4 weeks.
The Spa Frog bromine cartridge should be adjusted to dispense 1 - 2ppm of Bromine into the spa water.