He might be running a res, at least that's why I do it. Sometimes the plant drinks more than it eats.Yes, but don't pH the water.........wait and pH the whole solution after you've watered it down.
Why not just add less nutes so you get the ec you're shooting for?
ThanksIt's better to use ro water to bring down ec but if you dont have an ro system diluting it with tap is fine. It just takes more water to lower it