FROG Serene® Bromine Replacement Cartridge - Yellow 5.3 oz Freeflow Spas Pillow The bamboo-oil-treated surface and rounded

The bamboo-oil-treated surface and rounded shape

The Freshwater™ IQ Sensor should be replaced every 12 months

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

The hot tub industry found that it's a perfect protectant for vinyl hot tub covers

Each test strips tests for Sirona Simply Sanitizer

FROG Serene® Bromine Replacement Cartridge - Yellow 5.3 oz Freeflow Spas Pillow The bamboo-oil-treated surface and roundedThe FROG Serene (Bromine) Cartridge is for use in the Serene In Line or Floating system for hot tubs and spas. Size: 5. 3 oz The FROG Serene (Bromine) cartridge is the active sanitizer in this system. Use in combination with the FROG blue Mineral cartridge, found here. If you want to buy more than one yellow Serene cartridge at a time, check out the FROG Serene (Bromine) Combined Cartridge Pack for savings! Please Note: FROG makes Serene Bromine