Tetra Europe has now completed a comprehensive filter replacement programme for Severn Trent Water at the Hinckley sewage treatment plant in Leicestershire, UK. The project has already produced impressive results, and the company considers it an excellent illustration of the adaptability of its filter technology, enabling new filters to be successfully installed in an existing facility with minimal investment in new civil works. Here Howard Rundle, technical manager and Julie Trafford, process specialist at Tetra Europe Ltd, describe the company＇s deep-bed filter technology at the heart of the Hinckley retrofit programme.