Spa Frog Mineral Cartridge refill is for use in either the Spa Frog Floating System, or for users of the Spa Frog Inline System which is factory-installed in some hot tubs. Use with companion Frog Bromine Cartridge.
- Adjustable blue mineral cartridge
- For Frog Floating or Inline systems
Product notes: Replace mineral cartridge every 4 months when you drain / refill spa.