Hydrothermal Cleanup (HCU), US Patent 10,071,322 B2, is ARA’s novel and patented pretreatment process that offers several key advantages over traditional pretreatment processes, producing a clean stream of glycerides and free fatty acid products from lower cost waste feedstocks. HCU consists of a continuous, refinery-friendly, single-step process that utilizes common refinery equipment such as pumps, heat exchangers, and a hot oil furnace or refinery high-pressure steam. The HCU process requires only water, heat, and pressure to remove metals and other inorganics from most common feedstocks.