Sewage treatment plants require servicing and desludging to ensure the effluent quality and long term running is not affected. If the following DOs and DON’Ts are taken into consideration by the homeowner, the treatment system will offer many years of trouble-free service. It is important to remember a sewage treatment plant is a biological process rather than mechanical process alone.


  • Electrical supply to the treatment plant must be maintained constantly.
  • Check aeration pattern in the treatment zone is evenly distributed.
  • Check air pumps inlet free from dirt and filter changed if necessary.
  • Be aware before you put anything down the sink, toilet or drains.
  • When using cleaning product little and often so the treatment plant isn’t overloaded.
  • Bleach can be used sparingly.
  • It’s best to spread your washing throughout the week.
  • Use the same washing, cleaning, dishwashing, and all other cleaning products. The bacteria in the sewage treatment plant work more effectively with cleaning products they are familiar with.
  • Service engineer to carry out regular service schedule in accordance with you ‘Operation and Maintenance Manual’.
  • The tank to be emptied of excess sludge – the interval is based on the size of the plant and its loading.


  • Turn off electrical supply to the sewage treatment plant.
  • Strong chemicals, house hold bleach, medicine, mouthwash, garden chemicals, disinfectants, ect. down toilet or sink.
  • Put incontinence pads, cotton wool, baby wipes, disposable nappies, tampons, sanitary towels, condoms, ect down the toilet.
  • Service the sewage treatment plant unless your trained service engineer.
  • Use any replacement parts other than recommended manufactures part.
  • Make any alterations, modify, repair, other than permission from the manufacture. Works must be carried out by a trained service engineer.
  • Surface water or roof water to enter the sewage treatment plants.
  • Macerator fitted to the kitchen sink.

The Environment Agency ask the owner to keep log-book of the past 5 years of all servicing, repairs, and tank emptying. Please check the ‘General Binding Rues’ to make sure your discharge to watercourse or soakaway complies to Environment Agency.


  • Inspection lid lifting.
  • Wastewater backing up from the sewage treatment plant.
  • Sewage treatment plant causing unpleasant odour.
  • Land around the sewage treatment plant or soakaway wet, soft, or waterlogged.
  • Effluent produced cloudy in colour or grey.
  • Septic at discharge point e.g. sample point, watercourse, sewage treatment plant.

Get A FREE Site Survey