BG: Here is my very low cost, low tech solution to getting powdered ag lime into my pond. It is a wooden platform in the front of my little plastic boat. I load about 200 lbs of lime onto it, then spread it with a scoop with the wind at my back. It isn't as efficient as the pontoon boat/trash pump combination but it works and costs almost nothing. My pond is about the same size as yours, and I spread 1,400 lbs in just over an hour. I'm going to spread a few thousand pounds more on the ice using a fertilizer spreader on the back of my little tractor just before the Spring thaw, then get a repeat water chemistry test a couple months later to see how I did.

[Linked Image from i.imgur.com]

Good luck with your project.