Your experience with cleaning waste oil using a motor driven centrifuge or a series of sock/basket filtering down to 1 micron filters. I dont want to include lube pump driven centrifuges because of they are only in the bowl a few seconds, compared to a motor driven centrifuge that has 3-4 minutes separation time in the bowl. Im trying to figure out cost effectiveness over time. Sock/basket filter housings are 500$ each and I would need at least 2, along with a Imhoff style heated settling tank at another 2500$. A good high speed belt driven centrifuge is 2500$, and should have a heated tank to draw from, or at least a inline heated element, which is harder to control a constant temp.