I dunno know the ph of my soil was going to figure that out tomorrow since I have to wait for water to cure. I was going to test the run-off water when I flush it. I am using Experts perfect mix and I believe Ph was like .08/.06/.06 or something like that. Oh duh. I dunno the ph. I use epsom salt so I dont know if it is a mag. diff. I checked a couple sites about difficiencies. What is a good source of chelated Iron? Does anyone know?