oti$
Active member
I use tap, but my tap ec is so low it barely registers on my truncheon. If i had tap that had an ec like yours, id definitely use ro. I would normally suggest 50\50, but with an ec that high, 80\20 would be a good idea. I have also have found that mixing tap with ro helps to keep ph more stable due to buffers that help keep municipal water supplies at a constant ph. By using ro or mostly ro, you will have a more accurate idea of whats in the solution you are feeding your plants. Im also pretty sure that mostof the minerals and salts n tap water aren't available to the plants, i learned that last tid bit on the internet, so im not 100% on that one. Good luck!