This Spa Frog four-pack contains one mineral and three bromine cartridges, for a three month's supply of spa sanitiser.  Use these cartridges with the built-in Spa Frog System available on Spaform's Prestige Range and Marquis spas, among others.

The Spa Frog system is also available as a floating dispenser to fit inside spa filters.

The bromine cartridge is adjustable so you can maintain exactly the right level of bromine in your spa.