If you are shooting for a ppm of 1000 when mixing nutes and your water ppm is 150 ppm do you still shoot for 1000 or 1150?
Just don’t count the 150 in the final numbers. You’re good.
Thanks for the reply .i’ve always been curious about that what most do.
COVERTgrower is correct.
I have never checked ppm or will I ever. I think it’s bunck.