This large pond liner is 15m x 15m in size (49′ x 49′). This is a very large waterproof sheet which is guaranteed for 15 years and can be used to line a pond excavation measuring (LxWxD) 12m x 12m x 1m (39′ x 39′ x 3’3″). If a pond is built with the dimensions specified it will be able to hold 144,000 litres of water (31,718 gallons). The ‘Flexiliner’ by PondXpert is being successfully used in thousands of water garden installations across the UK.