Thanks but how do i make the adjustment if the pH is off? I am using gallons of purified drinking water because i have well water at my house.
First, A/G recommends that you don't use well water because of the mineral content. They say tap water is okay but that hasn't worked for me. The stuff that comes out of my tap is crap. Either of the two will plug up your delivery manifold on the underside of your planting deck. My best advice to you is to buy distilled or good bottled water. I'm looking at a reverse osmosis filtration system because water is everything to us.
If you're using A/G's nutes all you can do is mix it, test it, and balance it then let it sit for a day. Just follow the directions with the pH kit you should have purchased by now. The thing to remember is that you want to keep it between 5.5 and 5.9 with 5.8 being best. You'll do that initially and every day after because as your plants take up the nutrients it's going to drastically change the pH. Mine usually goes up and I have to add a little pH down, (Acid). But don't go overboard. I'd rather add a few drops two or three times and stir it up than add six drops and find out you're over and then have to add the opposite. Also, figure on changing your nutes weekly if you don't want water related problems.