Spa Frog Bromine 150g
The Spa FROG In-Line System offers water care that is built into the hot tub with no touching or measuring chemicals. The long lasting replacement cartridges provide "set it and forget it" convenience for weeks at a time. No need to add a shock before and after use - once a week is sufficient. Let FROG do the work for you while you relax and enjoy your hot tub.