Brewing Kombucha: How to Remove Chlorine and Chloramines From your Tap Water?
Filter it. Luckily, water filters are pretty inexpensive and last quite a while. This is probably the best and most practical option. Look for systems that use charcoal filtration, which most do now. The charcoal works to absorb impurities in the water and is effective in removing most of the chlorine and chloramines. The pitcher style filters, like the Brita Filter, use charcoal. I hooked up an under-the-sink filter in our kitchen, similar to this one that I LOVE. It has a separate faucet that comes up next to the main, making it simple to fill up a pot of water or my dog’s bowl, too!
Boil it. Boiling the water for 5 to 10 minutes allows dissolved chlorine gas to escape. Chloramines prove much more persistent than chlorine, which is the very reason they are used. While chloramines can eventually be boiled off, eventually, the amount of time this takes varies from sources from 20 minutes to several hours, to not at all. For this reason, it is recommended to filter water that contained chloramines after the boil, so really, why boil in the first place? The downfall of using the boil method is that you have to boil all the water for the brew. This means you have to wait forever for the water to cool down. If you have room in the fridge, you can put the pot in there for a few hours and try to speed up the process. Or you can boil the water the night before so it will be ready to use the next day, be sure to add the tea and sugar the night before.
Let it sit. For water with chlorine, you can just let it sit. This method’s limited and somewhat outdated now as the use of chloramines is much more common. Nonetheless, chlorine gas will evaporate on its own at room temperature if you let it sit for approximately 24 hours. The exact timing can vary depending on chlorine content, but 24 hours is a rule of thumb.