It takes awhile to get the hang of how much to adjust "how much". Then things change as your supplies get older and take more to do the same job. In other words...no...there is no set amount; it depends on tons of factors and those factors change all the time. There's a chart around somewhere........I think Dutch pimp has a chart for hydro ph.....but if your medium, nutes, and water are all stable then your ph should stay pretty stable as well.
Weedhound Reviewed by Weedhound on . PH Levels What is the acceptable PH range in Hydro? Searching PH gives me no results... Rating: 5