If you’ve noticed that your tap water smells strangely like it’s coming directly from a swimming pool, don’t fret—it’s supposed to. From today until the end of April, D.C. Water is switching up the disinfectant it uses:

During the majority of the year, chloramine is used for drinking water disinfection in the District. For a short period each year, disinfection switches from chloramine to chlorine. This change is part of an annual program to clean water pipes in the District and maintain water quality throughout the year. A temporary change to chlorine is a standard water treatment practice for water systems that use chloramine during the majority of the year.

If you notice the smell, D.C. Water recommends that you flush the cold water tap for two minutes, run the cold water tap for five to 10 minutes when you haven’t used water for a few hours and refrigerate and collected water for a few hours before drinking.