Chloramine is now used as a disinfectant by many municipal water providers and it is harder to remove by using standard carbon filtration. 
Chloramine is a much more concentrated process compared to the filtration for chlorine. 
Chloramine needs specific contact time and slower flow rates through a specialized filter media specifically created to treat Chloramine.

Our chloramine filters are optimized for craft beer breweries, distilleries, food & beverage companies, and applications where chloramine reduction is required!