"I have been using a Dieselcraft centrifuge (CF, designed originally for lube-oil bypass filtering, price= $200) to filter my waste vegetable oil (WVO) and it works great. I no longer need to buy replacement filters, and it dewaters the VO (which no filters can do - including "water block" types.). I put the VO sucked right from the dumpster through a 100 mesh screen into the rig, no settling needed. The VO needs to be heated to >120F and then pumped through it at 90psi and 0.9gpm. It spins at around 7000 rpms. The way I have the water heating elements, it is removing water both by centrifuge action (the best) and by Flash evaporation. I have sent samples to a testing lab and it showed good results, both for water and particle removal."

http://www.xyzworks.com/centrifuge.htm