We now have biodiesel! But there may be impurities left
so the fuel is filtered – thrice. First there are two
stages of 10 micron filters to remove the larger
particles. The second stage takes the fuel through a 2
micron screen. This process happens as slowly as
possible to allow the water traps to operate.
Remember – biodiesel doesn’t produce nasty particulates
when it burns, unlike mineral diesel.