The Conversion Unit Problem & Solution

Compromised Septic Tank, Failed soakaway, Illegal discharge
The Conversion Unit
Brentwood, Essex, CM14
30 September, 2014
Dry, Poor Ground drainage, Clay Soil
5 Person


Mantair was contacted by the owner of a property regarding the problems they were experiencing with their septic tank system.  The property is located on the outskirts of Brentwood in Essex.

On inspection of the drainage arrangements it was found that the property drained to a septic tank located in the rear garden of the property.  On internal inspection of the septic tank it was evident that a submersible pump had been installed within the tank with the sewage effluent being pumped directly to a boundary ditch.  It transpired that the previous owners of the property had installed the pump due to the septic tank soakaway failing.

On further inspection it was found that the existing septic tank was in good structural condition but there was insufficient land available for the construction of a new soakaway.   It was therefore necessary for a sewage treatment system to be installed which would produce a treated effluent suitable for discharge to the boundary ditch.

With the existing septic tank being in good structural condition and sufficient capacity Mantair recommended the installation of a septic tank conversion system.  The Mantair conversion unit is specifically designed to fit within an existing septic tank or cesspool, effectively ‘converting’ the existing tank into a small sewage treatment plant.  The treated effluent produced from the Mantair unit complies with the requirements of the Environment Agency for discharge to a natural watercourse.

To minimise the disturbance to the garden the existing pumping main was reused with a new pumping station being installed and connected at the ‘head’ of the pumping main.  The air blower for the Mantair septic tank conversion unit was positioned within a Beehive blower housing – a purpose built housing designed to blend into the garden setting.


Prior to any works commencing Mantair obtain a Permit from the Environment Agency for the discharge to the boundary ditch.

As with the majority of Mantair septic tank conversion system installations, the disturbance to the garden was minimal with substantial cost savings when compared to the installation of a packaged sewage treatment plant.

Mantair provides a comprehensive septic tank and sewage treatment plant service throughout the majority of the UK. This includes free site inspections, guidance and advice on the most suitable system for the client’s requirements, complete installation, commissioning and full after sales care.

If you would like a Mantair engineer to visit you regarding a septic tank conversion system or sewage treatment plant installation, please fill out the form below or contact us on 01255 853890.