United Utilities is the main regulated water and wastewater services provider for North-west England, supplying some seven million people daily. In June 2014, the company needed to undertake essential investigative work on an existing nitrifying trickling filter at Huyton Wastewater Treatment Works near Liverpool.
The work could only be achieved by taking the filter system off-line, which meant installing temporary package treatment plant to keep the site operating at full capacity.
