Frog® Serene Mineral Replacement Cartridge


  • Spa Frog SERENE
  • Mineral Cartridge


Spa Frog’s Mineral Cartridge provides spa and hot tub owners utilizing the Spa Frog System with an easy way to introduce water softening minerals into their systems in a handy self-contained replaceable cartridge, eliminating the need for time-consuming chemical additives. Mineral Cartridge softens water as well as making it easy on your skin and eyes to provide a bathing environment that chlorine-based systems cannot match.

Refills for use in the Spa Frog Floating System or Spa Frog In-line System, factory-installed in selected newer spa models including: Emerald, Saratoga, Caldera, Marquis, Morgan, Watkins Hot Spot, Pacific Hot Tubs, and Leisure Bay spas. Minerals used on max setting #6.


  • For use with Spa Frog floating and In-Line Systems
  • One cartridge last 4 months
  • Used with companion Frog Bromine Cartridges.
  • Spa Frog Mineral Cartridge 5.3 oz.
Frog® Serene Mineral Replacement Cartridge

Additional information

Weight 10 oz
Dimensions 10 × 3 × 1 in
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