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Introduction As the renewable fuels industry grows, the shift from traditional fossil-based feedstocks to fats, oils, and greases (FOG) brings new challenges - chief among them, managing contaminants. The choice of pretreatment technology is critical, as it directly impacts downstream processing, product quality, and operational efficiency. The role of pretreatment in renewable fuel production The hydroprocessed esters and fatty acids (HEFA) route to sustainable aviation fuel