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Replacement Mineral Cartridges for Spa Frog Serene Floating System, and spas with factory-installed Inline System. Use with companion yellow Frog Bromine Cartridge.
- For Frog Floating or Inline system
- (3) Mineral Cartridges - Year's Supply
Product notes: Replace mineral cartridge every 4 months. Yellow Spa Frog Bromine Cartridges available (below).