I appreciate all the good info. I have a good source of Bio feedstock but not a lot of time and a very rambunctious 2-yr-old son that might find the operation (which involves caustic) very interesting. Purchasing Bio here is expensive and really inconvenient but that is soon to change. Soon Houston will be Bio-Central as 4 large plants are going in right now that I know of involving some big players such as Stolt-Nielsen and Dow Chemical. I will share that I read a post on the web last nite that claimed there is a danger of separation at cold temperatures and beleive it or not it does get cold down here in the winter. The writer did not specify temperature but had experience with the SVO stratifying to the bottom of the fuel tank during cold conditions. That would be a pretty easy home experiment to prove in a clear bottle and a refrigerator I would think.