18x20 Black Pond Liner - 20 Mil PVC (5.49m x 6.1m) - Fish & Plant Safe for Koi Ponds, Water Gardens, Streams - Durable Waterproof Liner for Outdoor Landscaping & Backyard Ponds

18 Feet Wide x 20 Feet Long Flat Sheet Pond Liner in 20-mil Black PVC. PVC pond liners are extremely flexible and are a great choice for conforming to tricky pond contours. Our liners are formulated for this application making them both fish and plant friendly. We always suggest that you cover any exposed surfaces to prevent them from coming in direct contact with UV rays. This listing is for a flat sheet pond liner. What does that mean? That means that the liner is made from a flexible material that is designed to be draped into your pond, tucking an folding it into position. IMPORTANT - You need to account for your pond's width, length and depth when choosing the correct liner. Measure your pond by adding the following: Overlap + Depth + Width + Depth + Overlap to find the absolute minimum liner width you require and then repeat the process for the length of your pond. Tip - Be sure to order a liner at least slightly larger than you calculate (you can always retain the extra for future use). Note - All of our liners are made-to-order and most sizes do require us to weld multiple panels together but rest assured, our Quality Team checks every weld before we package the finished product. As with all of our products, these pond liners are proudly made in the USA!