Large Klargester Sewage Treatment Plant installed in Middlesex. A customer in Middlesex with two permanently failing Septic Tanks on their estate contacted us to devise a plan to solve their ongoing drainage problems. We were quick to act and advised the customer that the installation of a large Klargester Sewage Treatment Plant, to take the waste from the two Septic Tanks, would be the best solution. After mobilisation of machinery and equipment to site our work began. Due to the vast distance between the Septic Tanks, the ideal location had to be appropriately selected to ensure that the waste could sufficiently travel to be treated. This meant trenching a slot trench 150 metres in length for the pipework to be laid across a field to where the new Klargester Sewage Treatment Plant and Soakaway had been installed.