That calculator will definitely help, I watched the video and I think in theory I understand what needs to be done I will definitely try and use calculator. Just wanted to ask one more thing at this time, my top water DTS is 260 In my research, I believe this is not very good for the plants. So my question is, if I use dry salt, do I use RO water and remineralise with Calcium and magnesium to get DTS about 120 or to mix tap water and RO I would prefer if I can get away with not using RO at all but not sure if that is possible. I used drys salt before from Aquarium Plant Food website and head good results, I used instructions that came with the salts, but that was long time and I lived in different property. So maybe tap water was different.
Thank you very much I appreciate your advice.