From what I've read so far AN has a tendency to raise the PH. General hydroponics is more stable.
Lemon juice will act as PH down (acidic of course) and baking soda if/when you need to raise your PH.

The best way, according to the experts, is adjust the PH before you add your salts(Ferts), and then again after the salts are added. I have always adjusted the PH after the salts are added, and have never had a problem.

But it is truly a choice of preference, just make sure the PH is correct before watering or feeding.

Peace...Buddha

Buddha, not to question the experts, but why bother adjusting the pH before adding ferts ? In the end, it makes no difference whatsoever... or am I missing something ?

I would have need of echoing what DB said, why would you adjust prior to adding nutes? I have never done that as it does not make sense to me to do. But if you can convince me, I am listening.

As I stated in my earlier post...I have never adjusted the PH, until after the salts and all additives were in the solution, I do it at the end...Still today. For the exact reasoning you both stated, seems kinda pointless. What was said in the article as to why a before and after adjustment was that "If the ph is out of wack the salts wouldn't dissolve properly, so adjust the ph before adding salts, then again after adding salts, then all ingredients would dissolve". I don't understand this thinking either. If you added the salts and the PH was out and the salts didn't dissolve properly, as soon as you adjust the PH so it is good, the salts would dissolve....I would think Correct.

So to answer your question on why before and after, really doesn't make a whole lot of sense to me either. I was merely reporting information I had found.

Peace...Buddha

PS. I mix my own salts to create my fertilizing solution, and I always have a little un-dissolved particles at the bottom swirling around. Maybe I should try adjusting PH before I mix next time, see if I can illuminate these partials. It may pertain to the old powder and crystal ferts that I still use, and not to the liquids that are used used today...Buddha

I'm with you on that one, doing it beforehand also would raise the content of acids/buffers in the nutes that just don't need to be there. If something did not disolve properly it will when I adjust the ph. I often agree with the experts but I don't think so in this case.

Just an idea.

I adjusted my PH before and after adding the salts for the past few feedings.

As far as I can see, it makes no difference. The partials are still present if you adjust PH before and after. I can see this being a bad practice, because you put much more chemical in the feeding solution, this can't be good for the plants. When I adjust at the end only, as I have always done, I use a few drops of PH up or down. When done before and after, I was using much more than a few drops.

So in this case the Experts are wrong.

Peace...Buddha

4000 watts + 24 plants = 34 Oz. Basically same as last time. Only 2 ounces more total from 4 extra plants. Pots were same #2 as last time, and I fed better than last time.Hmmm.

Next time around I have moved to #3 pots. Pot size is considerably larger than my #2's Same light, same food, and 20 plants. Topped a couple of times, as usual.

How come you're moving from 2 gallon pots to 3 gallons when you have 6 plants per light? Get some 5 gallon buckets, drill lots of holes all over that bastard, the bottom, the sides drill your heart out and quit dicking around with those small pots. You're spending all that money on electricity, nutes, time, energy and you're using 2 and 3 gallon pots. You can use the 2's for veg if you want and go into buckets or geopots and you'll never look back but don't do another round and wonder what you could have done better once it's done cuz now is the time to correct it, best of luck