Spa Frog Serene Bromine Cartridge 200 gram size for the In-Line Cartridge System. The In-Line system is one of the easiest ways to maintain your hot tub water. Simply replace the cartridges every 2-5 weeks depending on your hot tub usage. The 200g cartridge provides 33% more Bromine than standard Spa Frog Bromine Cartridges, extending the time between cartridge changes!
Works with In-Line Cartridge Systems only. Use the Spa Frog Serene Bromine 150g for the Frog Floating System.
Product style and packaging may vary.