Spa Frog Serene Mineral Cartridges for use in Floating System, and spas with factory-installed Inline System. Year's supply.
- (3) Blue Mineral Cartridges (ea. lasts 4 mos.)
- Use with companion Yellow Bromine Cartridges
Product notes: Also fits Frog’s Inline System, factory-installed on hot tub models by Bullfrog, Caldera, Cal Spas, Catalina, Coast, Emerald, Hot Spot, Hot Spring, Leisure Bay, Marquis, Morgan, Pacific, Saratoga, Watkins, others.
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