The ideal foundation of your pond, our 13 ft. x 20 ft. PVC Pond Liner is perfect for ponds up to 1600 gal.. This liner is built to last, reinforced with mesh for puncture and tear resistance, making it stronger than traditional PVC. With a thickness of just 20mil (0.508 mm), this liner is super lightweight and easy to install. It also promotes a healthy aquatic environment by encouraging beneficial microbial growth thanks to its textured surface. Plus, it's non-toxic and safe for all inhabitants, including fish, plants, and wildlife. We stand behind the quality of our liners and offer a 15-year warranty for peace of mind.. Capacity (gallons): 1600 gal. Fish Safe: Yes. Returnable: 90-Day. UV Resistant: Yes. Length (ft.): 20 ft. Product Depth (in.): 16.72 in. Product Height (in.): 5.60 in. Product Width (in.): 20.38 in. Thickness (mil): 20 MIL. Width (ft.): 13. Capacity (gallons): 1600 gal