FROG Serene® (Bromine) Cartridge - Purple 7.1 oz - 33% More Bromine Compared to Yellow Cartridge Oxidizer ~ Made in the USA

~ Made in the USA ~ only 2 left as of 5/5/2025Color : Marina Blue      Pillow Size: 10" x 9" x 3"

A single Freshwater Salt System titanium cartridge will last roughly 4 months

The gift certificate cannot be used in our online store

Spa Frog Serene

• Envoy 2014-2018

FROG Serene® (Bromine) Cartridge - Purple 7.1 oz - 33% More Bromine Compared to Yellow Cartridge Oxidizer ~ Made in the USAThe 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)