FROG® Serene Cartridge Replacement for Minerals

$37.95  $45.95




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The FROG® Serene Cartridge Replacement is a mineral sanitizer that cleans and softens hot tub water inside your filter cartridge.

The unique design lowers the use of bromine up to 50% and helps prevent algae by circulating it through our patented mineral formula, destroying bacteria and dispensing a low level of minerals into the spa water.

  • Was formerly the Filter Frog Spa Water Care System
  • For the Spa Frog Floating or In-Ground System
  • Hot tub sanitizer for hot tubs up to 600 gallons
  • Fits easily into the center of your spa's filter cartridge
  • Simply supplement with 1 ppm of chlorine or bromine
  • Kills bacteria in 2 ways: with minerals and a low level of chlorine or bromine
  • The result is Fresh Mineral Water® which looks and feels amazing
  • Immediately effective
  • Helps maintain a neutral pH and keeps the water looking crystal clear
  • Lower your bromine or chlorine use up to 50% with minerals
  • Filters so the water feels soft and is easier on your skin, swimsuits and spa surfaces
  • Features a convenient reminder dial - set it and forget it for 4 months
  • Easy installation into most filters - no assembly required
  • Welded rod helps prevent breakage
  • Can be shortened, if necessary
  • Lasts for 4 full months
  • Model #01-14-3812 (3712)


This product is considered a "hazardous material," is air-restricted and cannot be shipped to Alaska or Hawaii.

All Chemical sales are final.