You’re right where I was when I screwed up.
Unfortunately, the dude I was modeling my grow after (he used autopots AN nutes and coco)
has not been around since June.
What I did yesterday as a test on two different batches was to add my base nutes A&B and then all of my supplements, mix and test pH. The pH was spot on.
I got into trouble adding silicate first, then ph balance the mix, then add my base and other supplements and test ph again. I was adding ph down after the silicate then more ph down after all of my additives.
Yesterday sort of proved, you do not need to do any of that.
I understand the pH perfect Nutes do 2 things
- they buffer your mix pH down (in my case to 5.9) AND
- They buffer the medium you’re growing in allowing it to accept (and use) pH values within a wider range
My suggestion would be to mix up a gallon the way you always do and use no ph up or down. Then check the gallon. If you get a reading anywhere between the range acceptable for your growing medium (for me it’s 5.5-6.5) then leave it and you are good to grow.
I plan to let my res bounce anywhere it wants from 5.5 - 6.5 and if I see it go out of that range, I will either dump and make a fresh res or top it up with nutes and see what my ph is afterward.
They say ph Perfect was designed for RO water but my tap comes out at 7.4 ph and these nutes slung that down to 5.9 without a problem.