snake oil

Hello, im new here too. Is anyone here actually makeing bio diesel?i am making modified used vegetable oil ( similar to bio diesel). I am having trouble with the settling out process. I have been collecting used vegetable oil from chip shops and resturants wich is a mixture of red oil (good) white fat (not so good) and food waste (bad). This is then left in the sun in containers and is then thermically sorted into the three components.The red oil is then poured off the top into the filters and the first stage of filtration is complete. If anyone has any tips on speeding up the settling out period i would be gratefull.