This cartridge kit includes 3 bromine and 1 mineral cartridge allow you to purchase the floating mineral system in more convenient quanties. * Purchase less often saving you time and money * Convenient packaging * No messily mixing of chemicals

• 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.