The secret is in the settling, heating and filtration. It's really a pain in the arse, but still worth it for my application. I use a 5 stage micron system, combined with a custom made gravity/sediment seperator, stage two tank heater (electric jacuzzi heater, evaporates micro h2o and thins oil for better filtration), water seperator, and 3 seperate 100 gallon storage tanks. good as gold, lots of work and maintainence. I also test the purity by boiling a bit on the stove and throwin' in some fishsticks..LOL no, but really, boiling a sample in a clear bowl and letting it cool will let you see how pure it is.
It's all still a messy pain though, only worth the effort if you plan on burning a lot of fuel and have the extra time and patience to do it all. the oil is everywhere, dohnut oil is the best! I'm sure there are plenty of people out there who will shoot holes in my system, but whatever, it works very well, and is just as good as the stuff at the pump, if not better. LOL.. I even thought of adding green dye for schits and giggles...
Capt.Flattymatty
"PREVAILER"
"to fish or not to fish..now that's a dumb question!"