With one of the quad stir plates TomB found on eBay (and repaired... and painted), stir bars, and a few erlenmeyer flasks we're going to be swimming in yeast. When these are full to 1000ml and the speed is set to 8 (it doesn't go to 11) these get a great vortex going. Anybody have a jar of slurry they want to take for a spin? (Hahahahha ha ha heh eh erm... OK).