February 11th. 2020.
I just fed the plant Fox Farm Tiger Bloom. Tiger Bloom is stored very acidic. I have to add 2ml of pH up for every 5ml of Tiger Bloom even with starting out with dechlorinated pH 7.6 tap water. As far as nutrition, I have found CalMag will not effect pH and has minimal effect on ppm. Same with Fox Farm Big Bloom (organic stuff). Little to no effect on pH or ppm. Fox Farm Grow Big brings my 7.6 pH tap water to a perfect 6.3 with general feeding. Both Tiger Bloom and Grow Big has a large impact on ppm.
I probably didn't put that very well together but I always feed at 900 to 1,300 ppm including the added pH balance. I check runoff with a ppm meter and make sure that I'm getting no more than that out to prevent lockout due to over feeding. High ppm in runoff around 1,300 ppm means I will run CalMag'd water through until I get ppm in runoff of 900 or less. Usually only takes 1 or two waterings for my plant at the moment. I add Kangaroots for a better rhizome area.