When considering installing a new sewage treatment plant it is advisable to contact a sewage consultant. A list of accredited installers and engineers can be found on the British Water website at
You can also use same website to check whether the equipment you are installing meets the current British Standards at
Given the requirement for ongoing maintenance it is recommended that you enter into a servicing and maintenance agreement with your contractor to ensure the continued good operation of the system. Planned preventative maintenance and servicing is likely to save you money in costly repairs.