In the course of the food grade vegetable oil production various cleaning processes are used (Fig. 5) [20], but their applicability for this type of material has to be examined in detail. Any of the main processing routes, furthermore any of the individual process steps can be applied for the treatment and purification of triglyceride materials, but there are some things that need attention in the case of this kind of triglyceride base stock. Waste lards from a rendering facility have a high free fatty acid content, and fairly high metal and phosphorous contamination, too, in comparison to the edible or less ‘‘waste’’ fats and oils.