At the top of the page is a tab growfaqs.Open it up and click on #4.there is alot of good info there.In the sub catagories is a section that has ph/ec/ppm.they give you the ppms to use at different times of the grow cycle.OPH
Xare, thanks for the info.
I am growing hydro my first time and am trying to learn from everyone. I do not have a ppm tester and have recently been wondering what the ppm is..... Is there a chart that shows the ppm that you should have at each stage?