The HRS Unicus Series uses a patented stainless-steel scraping mechanism which moves hydraulically back and forth within each interior tube. This movement performs two key functions: it minimises potential fouling by keeping the tube wall clean and creates turbulence within the product. Taken together, these actions increase heat transfer in the material, creating a highly efficient process which is ideal for extremely viscous and high fouling products. Because the speed of the scrapers can be controlled separately and a number of different scraper designs have been developed for different products, the action of the Unicus Series and the speed of the scrapers can be optimised for a particular material. The Unicus Series has proven particularly useful in treating the digestate from anaerobic digestion processes where the texture and consistency are particularly challenging.