Figured I'd follow up since i actually did the alum / lime...

So far the results are great. I had less than 3 inches of visibility before and now have at least a foot and a half. fishing has dramatically improved.

I bought an old pontoon and removed all the seating and steering console. I had a 250 gallon tote which i placed in the center of the boat. I added a 2" bulkhead and shutoff valve about halfway up on the opposite side from the outlet on the bottom, then I piped in a trash pump to the bottom valve. On the other side i hooked up 10 feet of 1.5" pvc pipe that ran out to the bow of the pontoon. I had two ten foot 3/4" pipes coming off a T (forming a sort of spray boom) but that was WAAAY to slow.

So i used one trash pump, pushing pond water IN to the tank and letting gravity push the mixed water/alum out. It seemed to work pretty well, even though it was a lot of work. I would never want to do it again, especially without a helper or two, but im glad i got it done. Happy to answer any questions if anyone has any.