TheFROG Serene Cartridge Replacementis 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 bycirculating 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 isFresh Mineral Waterwhichlooks and feels amazing
• Immediately effective
• Helps