My 1 gallon glass jars have a convex bottom and I guess the fluid dynamics don't allow the stir bars to stay centered over 400 RPM... So, flat bottom erlenmeyer is the way I'm going - probably joining most brewers out there?
I'm looking to snag a few 2000-4000ml Borosilicate erlenmeyer flasks for yeast starters - they don't have to be "Pyrex" brand - actually, I prefer not to pay for the silk-screened name. However, the only ones I've been able to find are over $100 and even I'm not that nuts!!
Anybody have any recommendations on where to find such flasks for a more reasonable price?




