There’s nothing to measure or pour. Simply dial in your use level on the mineral and bromine cartridges and insert them into the integrated housing. Other than testing your water weekly, that’s all you need to do! The FROG system will continually keep your water crystal clear. The system uses fewer chemicals than traditional systems and contains a combination of specially formulated minerals and bromine that are gentler on your skin. Treating your hot tub with bromine also eliminates the harsh smell associated with chlorine sanitizers.