Just something I've noticed, which others might find useful ...
The tap water here is hard.
EC runs at about 0.5 to 0.6.
pH can be anywhere from 7.6 to 8.2.
I have been using the Advanced Nutrient 'pH perfect' range - both Sensi and Connoisseur - but when testing the feed prior to application, found the pH was still 'too high'. I was trying to get it to pH 6.3, because I thought that was the thing to do to get it into the sweet spot. And so I would use a pH down to get it to where the 'pH perfect' range couldn't, due to the tap water [poor] quality.
So I would prepare the pH perfect feedings, and then add pH down to religiously hit 6.3 for every feeding.
I was anal about it.
All the books said 6.3 was the sweet spot, so that is exactly what I was going to give them.
In my Grow No.2 I had some major pH issues early on.
The leaves were delaminating, and it generally did not look good.
It was a real head fuck, because I knew the feed and soil was where it should have been.
THEN I read about the 'buffers' in AN's pH perfect range, and a bit on how buffers work, and the fact that they're still active after the application, in the soil.
So this grow, I have stopped using any pH down product, and just left the pH perfect to do its thing.
Feeds have been pH 6.5 and even 6.6, which is higher than I would have normally given, BUT, here's the thing ... I'm not having the same pH issues I have had in the past when using a pH down product.
I don't know the exact science behind it, and my conclusion is somewhat anecdotal and unproven - but it seems the pH issues in Grow 2 were from the pH down product itself, in isolation. Almost like everything else I was adding didn't exist, an the only product the plants were reacting to was the pH down, which of course, is a strong acid. Hence, pH issues. Just letting the soil, the AN pH perfect range and the included buffers is all that is needed.
I know this might be a "no shit Sherlock" thing for most growers, but maybe there are other 'unconscious incompetents' like me, who might find this epiphany useful.