Introduced in 2011 the Blagdon Ultimate Pond Lining System has proven to be a popular choice. The lining system consists of a finest top quality PVC pond liner along with underlay of matching size (with 20cm overlap). This liner system carries a Lifetime guarantee from the manufacturer. The liner in this set is 3.5m x 3.0m (11'6" x 10') & the pond liner underlay included is sized 3.9m x 3.4m (12' 8" x 11' 3").