Chlorine is common in the tap water in some countries where municipal water supply use it to disinfect the drinking water. Brewing water should be free of chlorine since it hampers yeast growth and cause off-flavors. Activated carbon filter are excellent at removing chlorine and related poor taste and odor.
If softening by ion exchange is used to adjust the hardness, chlorine must be removed from the water prior to the softening treatment, because it can cause severe damage to exchange resins.
Many breweries face problems caused by iron precipitations in pipes, tanks, boilers and other equipment. Usually it happens when water source is groundwater and the iron is not removed. Iron can also affect the quality of the final product. Thus, filtration is the optimum solution.
Instead of just a replacement of the existing water treatment plant, the Danish brewery Harboe upgraded to the RO-PLUS units with water recovery of up to 90 %.