The deal with their Ph perfect line is first you need to use Ro water to the results the state , secondly it does drift in a hydroponic system , however the nuterients are chelated so that all are available through the entire ph range .Nutes are fine but it will not do anything for pH.....And you pay more..
i've been loving the gh trio for a little over a year now. but i got sucked in to using a bunch of the additives lol.I'm using General hydroponics trio and Cal mag. Ive been growing for a couple years and just finished my first bottle of bloom nutes (still have some from all the rest). I'm interested in trying other stuff but GH works just fine and its tough to shell out cash when ya got lots.