FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Brand_ULTCOVER Used for the connection of

Used for the connection of your hot tub's subwoofers

Backwash filter according to manufacturers directions

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

Completely portable

Treated with Myclex

FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Brand_ULTCOVER Used for the connection ofThe 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