I use R O water. I've always gone my own way on feeding. I do everything by ppm. I'm currently feeding @ 700 ppms. Also, I'm setting my PH to 6.5 as I'm using soil and its working great! I'm re-using my organic soil mix. I merely cut out the stumps and planted in the holes. Here are those plants as of yesterday.
Awesome. I did check out their page looked the feed chart and FAQ over. It makes no mention to water source. If you don't mind me asking a few more questions: what kind of soil are you using?, what's your water source, and do you follow the recommended feed dose on autos? Thanks @pop22 !