2500lt Eco Septic TankDIMENSIONS Height : 1 500 mm Diameter : 1 690 mm Manhole : 415 mm 6 to 8 People What is the difference between a septic tank and a conservancy tank? What's the difference between a septic tank and a conservancy tank? Septic tanks can only be used for the disposal of sewage whereas conservancy tanks are used for both black water (sewage) and grey water (bath water and washing machine waters). Product benefits Virgin food grade material. Unrivalled , 10