FROG Serene® (Bromine) Cartridge - Purple 7.1 oz - 33% More Bromine Compared to Yellow Cartridge

The FROG Serene® (Bromine) Cartridge is for use in the Serene In-Line System for hot tubs and spas.

This purple bromine cartridge contains 33% more bromine than the standard yellow bromine cartridge. 

Size: 7.1 oz 

The Serene (Bromine) cartridge is the active sanitizer in this system. Use in combination with the FROG blue Mineral cartridge, found here.

Not sure how to maintain or start up your hot tub on this system?
Download the FROG Serene (bromine) In-Line System operating instructions here.

Please Note: FROG makes Serene® bromine cartridges in yellow, green and purple. The purple and green are high capacity 7.1 oz / 200 gram cartridges which contain 33% more bromine than the yellow 5.3 oz cartridges.

If your hot tub has the FROG In-Line System installed, and you are on FROG Serene® (bromine), you can use either the yellow, green or purple FROG Serene® (bromine) cartridges.

If you are using the FROG Serene® (bromine) Floating System, only the yellow FROG Serene® (bromine) cartridge can be used. You can find the FROG Serene® Combined Cartridge Kit here, which can be used in both the Serene® Floating System and the In-Line System.