Thanks for your help I thought it sounded too good to be true. I think I'll look into a small commercial plant as we use a 1000 litrs per week of diesel at work. I can get vegetable oil at 57 cents a litre in 1000 litre quantities. Does that sound like a fair price as it seems it will cost an extra 20 cents a litre to make it into biodiesel.

John Crisp