Water is utilized in almost every step of the brewing process. The chemistry of the water can influence not just the taste but also the brewing efficiency. Therefore, it is essential that the water supply used is adequate for the job.
Chlorine is present in most municipal water supplies.
It is added to water to eliminate bacteria or other contaminants. However, excessive chlorine can greatly affect other beer ingredients, resulting in a harsh aroma and flavor. Chlorine can easily be removed by boiling or filtration. Another unwanted aspect of public water is its lack of hardness. Municipal water is generally soft due to the lack of minerals from filtration.