Ugh, that equation is terribly wrong.
If you dissolve solid potassium silicate in water you get a very basic solution (pH 14) of negatively charged, polymeric silicates and potassium counter ions. When further diluted the polymeric silicates break down into mono silicic acid and the pH can be lowered to plant compatible levels.
If the pH of the concentrated solution is lowered directly, without dilution, it just crashes out of solution and you get sand. Expensive sand that is.
The key when using silica additives to avoid that crash-out issue is to add the silica to a full reservoir of water first. I've used Silica Blast, Armor SI both seemed about the same to me. I ran silica additives for several years, and honestly can't really say that they ever made a noticeable difference in my plants, so I stopped spending the extra money on them. Same thing for Cal Mag, I ran it for years as just part of what was needed, but then ran out and my plants grew exactly the same and healthy as before so I stopped using it unless I had a specific strain that needed more.
It took me a minute to learn the trick to adding silica way back when, but I try to share it with anyone I get a chance to who is using silica. The silica additives having such a high PH meant I had to make sure I adjusted the PH correctly and I quickly noticed the white cloud of percipitate when I added the silica or when I added the ph down. After a little research, I figured out what was happening and changed my SOP.
To solve the issue, I mixed a test batch of nutes in my res to get all my measurements correct for my nutes and ph with everything added. I dumped that batch because obviously, it precipitated when I added the chems. Then I knew how much of everything I needed, and so I would fill the res with water and start adding with my silica first, and mix that in, then add the nutes and finally, any ph down that was needed to set my final number. Worked like a charm for years, and unless I changed up my recipe, I didn't have to make up test reservoirs each time, just mixed and went.