Chloramine in city water does not gas off like chlorine and it slowly wipes out the beneficial microbes that living soil CBD grows depend on. Hard water is a separate issue, since the calcium and magnesium already in it push the EC up before any nutrients go in. How to read a municipal water report and what to adjust for is explained on
https://calmcbdseeds.com in plain terms. A cheap carbon filter on the hose sorted the chloramine for me, and I now feed at lower strength.