FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Brand_ULTCOVER wears at the spa shell

wears at the spa shell over time

a removable side shelf tray

Completely portable

Phosphates enter from source water

Please consult your stove’s user manual for more specific instructions on cleaning

FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Brand_ULTCOVER wears at the spa shellThe FROG Serene Bromine Cartridge is the consumable yellow cartridge for FROG's bromine based Serene system designed for hot tub owners who want the cleaner, gentler water of a mineral and bromine program without the daily fussing of traditional bromine dosing. Each 150g cartridge lasts 2 to 4 weeks depending on spa size and use, releasing bromine at the rate you set with the adjustable dial. This is the standard single cartridge refill what you