Hidrostal and their pumps have played a significant role in the improvements made to the inlet at the sewage treatment works (STW) situated in and serving Esher in Surrey, UK. The Thames Water project to replace the existing pumps and pipework has been a joint venture between Black and Veatch and Costain who have overall responsibility. Hidrostal were awarded the contract to supply replacement pumps, and fifteen Hidrostal pumps were also used during the over-pumping project. The refurbishment started with a major over-pumping project to keep the sewage flowing to the STW; both the Esher and Hersham pumping stations had to be by-passed ensuring no adverse effect on the residents. This massive over-pumping project was delivered, installed and commissioned in less than three weeks. It involved the installation of 10 Hidrostal pumps at the Esher pumping station (maximum flows of 900l/s), 5 Hidrostal submersible pumps at the Hersham pumping station (maximum flow 410l/s) and over 370m of pipe was installed (70m at 700mm diameter and 300m at 500mm). The whole installation was controlled by a telemetry system allowing for remote monitoring.