Spa Frog Serene Bromine Cartridges for use in Floating System, and spas with factory-installed Inline System. Adjustable release rate settings.
- (6) Yellow Bromine Cartridges (ea. lasts 2-4 wks.)
- Use with companion Blue Mineral 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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