Good job with researching before the grow. I sorta learn as I go (my 1st grow) and have had some problems along the way. I've also been able to solve a few as well, thanks to the people and info found on this site.
Can't really help you with any of your questions except 1.
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6. As a matter of PH controlling, what is a good way to raise or lower water PH, and how does adding nutrients into water effect the PH, does the PH still need to be readjusted when adding Nutes or is the addition of nutrients neglible?
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My water ph is 9.2 out of the tap with 160ppm TDS.
When using straight water on the plant, I have to use ph down. I have heard of other things to drop ph, but I haven't used those and cannot comment on them.
Now.... once I add nutes to my 9.2 tap water, my ph drops to 6.3- just where I keep it for soil.
I don't know if all nutes will create this kind of a drop. Being my 1st grow, I have nothing for comparison.
Good luck with your upcoming grow.