@TooDogly Chlorine comes out easily... a couple of days on it's own, faster if you bubble it out. Chlorine is simple.
NOT simple is Chloramine, which most municiple water suppliers have switched to. Check you local service: It's likely they're using Chloramine, either instead of, or in addition to Chlorine.
The reason is simple: See how easy it is to remove Chlorine? It leaves all on it's own... it's just too volatile. Not good if you managing millions of gallons. Chloramine lasts for weeks or months, so it's much more effective. And a LOT harder to remove.
I recommend just using RO or distilled water, and add the elements needed back in to build back up. I use Burton Water Salts for my brewing, which is simple way to give you a water profile that's great for most English Ales, stouts and porters. You could dial it in further to customize for each, but that's a lot more stock to keep on hand and measure out for every single batch, so I stick with Burton to KISS.