Found it

For the last 13 years there has been a water leak at this property, over the last 3 years I have been involved in trying to locate this leak along with other associated people. In January I finally found the leak. The water here is residual that had filled an old swimming pool that had been removed. Over the last 3 years there has been a water loss of 23,652,000 litres of water. This has been a great result.