Towards the end of 2012 and into 2013, in the alterations to the Chilled Water Sytem, the Supaflex Division of Interflex Hose & Ltd, supplied a 150 mm Magnetic Removable/Demountable Microbubble Air & Dirt Separator coupled with a 150 mm Duplex Filter with fine mesh basket inserts to protect the system. It was Designed by Roger Parker Associates and installed by Adcock Refrigeration to ensure system protection to a very high standard. The Air Dirt separator is the most sophisticated model in the range, with 4 Magnetic Probes in the 150 mm unit and split base flanges so that the whole unit can periodically be completely dismantled and cleaned. The Johnson & Matthey Plant, on the Hertfordshire/Cambridgeshire borders at Royston, manufactures Catalytic Converters on the complex. Not long after, during March 2013 all Microbubble Air & Dirt Separator production was changed over from Carbon Steel to Stainless Steel.