RQS Green Gelato Grow 3

So far, what I've found is this. Usually, when metals react with certain dilute acids, they form their respective salts along with hydrogen gas and sometimes other by products.
In the case of potassium when it reacts with dilute sulphuric acid, the salt of potassium sulphate is formed in addition to hydrogen gas.

2K + H2SO4 = K2SO4 + H2

This is the reaction formula. So I guess I just need to research hydrogen and if it as a byproduct is anything to be concerned about.

I'm using phosphoric acid to pH down but might switch to citric acid, I'm noticing the amino acids I use have been bringing the pH down bit by bit but I need something to lower the it after silica. I could switch to using a silica dioxide but I heard citric acid doesn't stay stable or gets eaten up or something; so it'll be good enough to keep my pH down as not to cloud my solution when I'm mixing it. Yeah the purple stems are a dead give away but the P deficiency happened in veg, I'm working it back up right now. In regards to the Yucca I use it for the Saponins it contains (wetting agents), it's an aim on this grow to have as little to no salt build up and the Saponins assist in this. I don't know how I can really determine it's effectiveness for that particular use. All I know is my solution is stable and I literally add a pinch so the bag I got will last me for years...if it doesn't go out of date before then. It's a bit hard to compare grows as hydro and soil are really different. Anyways, I'm going to attempt making the concentrate tomorrow. Good luck and happy growing :)