Septic Tank Conversion

The Allerton ConSept is a septic tank conversion unit, which will convert your septic tank into a small package treatment plant. It is designed in accordance with BS6297:1983 - Design and Installation of Small Sewage Treatment Works.

The unit can convert a wide range of septic tanks and cesspools, both GRP and traditional brick built.

How it Works

Raw sewage gravitates into the septic tank/cesspool and is then aerated by air released from the bubble diffuser that rises up the distributor tube into the aeration zone. The sewage is completely mixed with the oxygen, which allows the growth of aerobic organisms that break down the wastewater contaminants, by biological action.

The air required for the process is provided by an air pump that is located in an adjacent shed or garage or within a purpose built GRP housing.

As raw sewage enters the tank, this displaces treated effluent from the aeration zone to the final settlement zone. The treated effluent flows slowly up through the final settlement zone until it reaches the discharge point.

The final effluent is discharged via the outlet syphon where it is lifted and flows to the discharge point, which can be at ground level. The discharge flow is controlled with a uni-directional flow regulator.


  • Utilises your existing septic tank or Cesspit. This allows for a quicker installation with less disruption to your garden and of course saves you money!
  • Fits inside the septic tank. Unobtrusive and quiet in operation.
  • Manufactured using composite material and non-ferrous fixings to stop corrosion and ensure a long and trouble free life.

Technical Specification

Population equivalent: 1 to 6
Maximum daily BOD loading: 360g per day
Maximum inflow: 1200 litres per day
Final effluent quality: 20:30 BOD:SS

Installation and Further Information

For further information on our septic tank conversion services or to arrange an inspection please call us on 01386 882324.

For further information on this new technology we install, please visit Allerton UK.