So pH runoff Does matter. Spent hours yesterday testing Every type of soil. And each medium gave the appropriate results. Garden soil 6.7pH & 279ppm, Cow Manure 7.3pH & 257ppm, Hot super soil 4.7pH & 2,800ppm, ProMix 6.3 pH & 365ppm, and 4:1 PM to HSS 5.2pH & 777-1,200ppm. My tap water going in is 9.0pH & 201ppm. So there is Definitely something to be said of run off even in "organics". Though I must say FOLLOW DIRECTIONS! Don't listen to me listen to Pattanhabi and Greasemonkey and Hyroot these guys know their shit and follow the rules. I'm mixing about 3:1 PM:HSS and my girls looks great! That's as far as I will go. Spreading the rest of my HSS into the garden and waiting a While and Couple runs before I "amend" again.