Well it looks like we have a winner hear. I stacked some magnets up I got off ebay and added a .090 thick piece of lexan and this bad boy will mix even a 5 gallon carboy. Now the bottom of the carboy needs to be reasonably flat so it will not work well with the plastic Better Bottles that have a big rise in the middle. I will try a larger stir bar in the future but the one I tried is 5/16" diameter by 2" long and it does work nicely. I'm hoping wine and mead makers could use something like this to mix additives and aerate. It will easily create a vortex in 5 gallons at 600 rpm. When I turned it up a little it would go to 700rpm and anything after that with this small stir bar it would throw the bar of center. It still looks like we could use these as is or experiment further with a bigger pad of magnets and bigger stir bars. So what do ya think?
Hope this link works. lol
Click on the pic and it will take you to the video.