My 12 oz works great for me. You could probably just pitch the next round with what you pull off of the bottom, but I always do a starter culture. However, with an 18 oz you can collect more yeast.
The yeast is quite clean after letting it sit for a few days at 38°F and decanting off the top layer of residuals. The picture is of a WLP400 and WLP550 mix that I added one part yeast 1 part glycerol for a freezer stock. I typically harvest at least 250 mL ( 1 cup) of yeast, which translates to...
I was drinking from my Klean Kanteen the other day (rehydrating) while shopping for yeast harvesters online, when I realized the mouth of the Kanteen is the same size as a 1.5" triclamp / sanitary fitting. After a quick drain on the 4th day of fermentation, I attached I a 12 oz. stainless steel...