Mineral cartridge is a replacement for the Spa Frog floating system. * The Mineral Cartridge for the 01143862 Spa Frog Floating System or Spa Frog In-Line System * Convenient packaging * No messy mixing of chemicals.  Mineral cartridge should be replaced every 4 months.

• VERY IMPORTANT:  Before using cartridges, establish a bromine or chlorine reading of 1.0 to 2.0 ppm with granular brominating concentrate or a chlorine shock.
• Maintain at least a 1.0 ppm bromine level at all times.  Test weekly for proper water balance and adjust if needed.
• Replace Spa Frog Bromine Cartridge every 3-4 weeks.
• Replace Spa Frog Mineral Cartridge every 4 months.