Yep. What I do is 1 of 2 ways. Either all R/O, or 3-1 R/O-tap water. I don't have organic cal mag yet so I like to mix in tap for some. I use Sunny-Dee containers so I know filled its a gallon without having to actually measure. Filled is a little over 1gal fyi. If using tap I put a airstone in and bubble for a day. I then add a drop of surfactant when I remember lol. Shake and take pH. Ist usually little over 7 sometimes just under. The NLS suggests 6.5-7, so I try to be as close to 6.5 without adding pH down. Mine isn't organic so less is best, but more important to have pH correct. It will kill some good bacteria, but they will grow back. If pH is off you will have issue without a doubt. So if I can get down to 6.9 with 1 drop I'll do that. I'm using OF with Pro mix which is supposed to buffer pH to 6.8. So if it does I'm good with the least non-organic stuff. If this makes sense I'm really stoned right now.Very cool. I'm still confused on water though. Tap water is ok and then you adjust the pH with a kit?
If you use another brand they may say another range. I am going to go by what they say to judge how well it preforms. I am going to bubble some water tonight so I can water in a day or so.