FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Brand_ULTCOVER Whether you're replacing a worn-out

Whether you're replacing a worn-out component or performing essential maintenance

a removable side shelf tray

wears at the spa shell over time

Pre-Treatment Checklist:

FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Brand_ULTCOVER Whether you're replacing a worn-outThe 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