Aaahh...if your purified water is 0ppm I would push 'em a bit more 630-700 ppm--don't know but your nutes probably have 1-2%Mg with all 3 parts and could stand a higher level. Are you using a truncheon ppm meter(400ppm reads as EC .8 x 500 on one side) EC x 700 on the other side is what you want to read (8=560ppm which would be fine) a 9 or 10 (630-700) is what I would run at that point (3sets of leaves?? pushing 4th??)--you may have a true 400 just wanted to make sure.
One more thing-just checking.....you do mix each of the 3 parts seperately for your nute solution right? Mixing the concentrates together prior to adding h2o will cause all sorts of lockout and strange behavior--for the same reasons the manufacturer bottles in 3 parts.
Not second guessing you--just trying to understand all variables--should be a help to both of us. Hope things continue to grow well for you, don't hesitate to ask if you need anything.
-OitW |