Pardon me for jumping into the conversation, but another tool to help speed up the drying process while bubbling is to run a small fan across the top of your open drying tank to help the air in the room absorb moisture from the bubbling process. I run 25- 35 gallon batches with KOH, washing three times with 10 gallons of water. After I get the translucent, clear biofuel I run the bubbler and fan overnight and it dries nicely.