If my PPM are 450 going in what is the range they should be when it comes out
What stage of growth?
How old are plants?
How big of a pot?
What kind of soil are they in?
Answer those questions and then you can start to figure out where your ppm’s should be…
Yeah def need to know all the aspects before making a decision soil is around 6.5 if using a dwc system then u flush everything out for a week at the end