I'm trying to study the ppm levels to know how much nutrients to use during each stage but from what I see it's only for solid nutrients, but I was only going to use 3 diff liquid nutrient solutions, I'm confused, help!?!?!?? So my basic question is does ppm levels relate to hydroponic growing?
Pick up a tds to measure total disolved solids..a lot of folsks use ec but I found tds easy enough on bubble buckets