If the water smells bad, many odors like sulfur, sulfides, and chlorine are the cause. These odors can be removed by catalytic carbon and can be regenerated. If the water supply uses a chemical called chloramines instead of chlorine to kill bacteria it can not be removed by a simple activated carbon and will give a medicinal taste to the beer. This can be removed by dosing the water with OXY-P. Minerals like Iron, Manganese Hydrogen sulfide and Arsenic can be removed by using KATALOX LIGHT®.