Tetra Pond PVC Pond Liner is made of high quality PVC that is resistant to damage from UV rays punctures and tears While extremely hardy and durable the liner is still flexible and can be cut to fit any shape or pond design Fish safe high density PVC material UV puncture tear resistant Can be cut to fit any pond design 15 year warranty Pond liner is 20 mils thick for extended durability Any rips or punctures that do occur can be repaired easily with a PVC Liner Patch Kit Measuring Tips Find the desired length and width of your pond and add twice the desired maximum depth Add an additional 1 5 to 2 feet to each figure to allow for the overlap needed to secure the liner in place Examples 7 L x 10 W liner fits 4 L x 6 W x 1 D pond 9 L x 17 W liner fits 5 L x 12 W x 1 5 D pond 14 L x 21 W liner fits 9 L x 16 L x 1 5 D pond