FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Electric_Fireplace_Accessory or several years of seasonal

or several years of seasonal maintenance

If it senses that water flow is too low or absent (often due to low water level

Discoloring or mold

slow-roasting rotisserie meats

FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Electric_Fireplace_Accessory or several years of seasonalThe 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