[Racefan]

It's not that I think you were rude and I probably was ruder than I needed to be but I'm here to help. Not hurt. If I say something it's to your advantage. The method your using is called the lucas formula and you don't even use the grow part of the solution for that. You should be doing regular reservoir change outs. At least every other week minimum. What you add back is determined by the solution EC. I too have a truncheon so I understand your readings. If your EC is too high you add back plain water. If your EC is low you add back nutrients until the EC reads right. It's that simple. Sorry for being rude. You have no idea how many young growers get on here and ask a question and then ignore all the advice they are given. It's frustrating and a huge waste of time I could be using to help someone else.