FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Electric_Fireplace_Accessory This is a small cartridge

This is a small cartridge doing an intermittent job on a pump that runs a few hours a day

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FROG® Serene Bromine Cartridge (Yellow) | Spa Refill Electric_Fireplace_Accessory This is a small cartridgeThe 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