FROG Serene (formerly Spa FROG) Bromine Cartridge - 4 Pack

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FROG Serene Bromine Cartridge is used with the FROG Serene Mineral Cartridge in either the Floating or In-Line System for complete water care that kills bacteria 2 ways and maintains cleaner, clearer, softer water that's easier to take care of. Simply set per the chart in the manual based on the hot tub gallons and snap into one of the holders. If using the In-Line System, snap into the bottom holder with the minerals on the bottom. The Bromine Cartridge will last 2-4 weeks depending on the hot tub size and use.