Description

The 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 reorder when your current Serene bromine cartridge is depleted. It works in two different setups: the FROG Serene Floating System (a floating dispenser that drifts around your spa), and the FROG In-Line System that comes factory-installed on many hot tub brands. The cartridge is identical for both — what differs is just where the cartridge sits in your spa setup.

The Serene system pairs this yellow bromine cartridge with a separate blue mineral cartridge. Together they sanitize two ways: minerals as a first line of defense against bacteria, plus a low, steady level of bromine handling the rest of the work. That layered approach is what lets the Serene system use up to 50% less bromine than traditional bromine-only programs — gentler water, less smell, and far less wear on swimwear and skin.

Why Time-Released Bromine Works Better: A bromine tab dropped in a floater dissolves at one rate — the rate it dissolves. You can’t really speed it up or slow it down. The Serene bromine cartridge has an adjustable output dial that controls how fast bromine releases into the water. Higher setting for hot weather or heavy use; lower setting for cooler weather or light use. Same cartridge, completely different release rate based on your spa’s actual needs — which is the difference between always-correct bromine levels and the boom-and-bust cycles of unadjustable tabs.
Brand

FROG®