Quote Originally Posted by Opie Yutts
I know mine are just for hydro. And PPM is a calculation based on what EC reading your PPM meter comes up with. Ebay usually has the best deals, and remember you usually get what you pay for.
Right on
cwesto Reviewed by cwesto on . how do you figure out PPM? Can somoen explain how you figure out PPM (parts per million) Thanks Rating: 5