Allerton are leading UK Manufacturers of Packaged Sewage Treatment Plant and Pump Stations. Allerton Specialise in Design, Manufacture and Installation of Sewage and Effluent Treatment Plant. Allerton Pump Stations for Raw Sewage, Dirty Water and Storm Water. If you have an existing Septic Tank or cesspool you can convert these into Sewage Treatment Plant using the Allerton ConSept. Experience Professional and Friendly Service.