The Sewage treatment plant 12 population gravity outlet E-Range Is easy to maintain as there are no mechanical parts or electrical components within the main body of the tank. The tank is supplied with a low visibility locked child proof pedestrian cover, all internal pipework and all external blower housing. The sewage treatment process takes place within the main body of the tank. Firstly coarse solids are filtered and retained for gradual breakdown. Then the resulting liquid is continuously distributed over a plastic suspended filter by an integral lift, powered by the externally housed blower (air compressor). Finally, the solids are allowed to settle and the treated effluent is discharged by means of gravity. Manufactured by Clearwater from glass reinforced plastic (GRP) and certified to EN 12566 - building regulation compliant. The Overall dimensions are 1900mm diameter x 2700mm high including 1000mm invert level.