SuperSmoker420
Active Member
This is my first grow and I'm using tap water in my hydro setup. My question is, Do you subtract the PPM of the plain tap water from the PPM of the water after adding nutes? Like for instance, if I was shooting for 700 PPM nute solution and my tap water comes out at 300, do I go with 1000 PPM solution? Another thing I was wondering was all those PPM guidelines, are they counting the PPM of the water as well or is that the PPM after subtracting that of the water?