With a large selection of liners available, it is important to always determine whether the liner you choose is safe for fish that may inhabit the pond. Aquascape 45 mil fish-safe EPDM pond liner leads the industry in quality and reliability. Backed by an industry leading 20-year guarantee, Aquascape pond liner is the choice of discerning pond professionals. With superior elongation and lay-flat characteristics, it installs easily with no special tools required. Aquascape 45 mil EPDM Liner also has exceptional resistance to solar UV, ozone, and oxidation.