I used this solution (not counting the new addition of extra K) before I put it into pumps, it was fine for the year before the pumps. Simply using the pump to do it instead of measuring it myself won't be a dramatic difference. I haven't had any issues with this current batch as far as my levels being off (been testing N & P levels since I made the change in K dosing to verify that).
I am going to remove the extra K from the dosing, like I mentioned earlier, just because I know it's pushing the limits and it's not really necessary anyway, but I could easily add extra water to help better keep the K2SO4 in solution instead (adjusting dosing time of course to compensate). In that regard I agree, the solution is a bit more dense at the bottom where it's taken up by the pump. It's just at the edge of staying in solution, so with a little swirl every week it's okay. I only have maybe two weeks left to go anyway.
If it makes you feel any better, I mixed up the solution (minus the meythlene blue & extra K) and let it sit on my desk in an erlenmeyer flask for months to see what would happen. It did grow an interesting little fungus, but otherwise no settling. So, while I understand where you're coming from, I've thought this through and I'm not concerned.
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