This document discusses several pond liner options. Pond Guard Liners by Firestone are popular EPDM liners that are resistant to microbes, algae, and harsh weather. They are easily repaired with adhesives. The Integra Liner is extremely flexible and economical. The aquaFLEX liner is made of polyethylene rather than EPDM and is suitable for uses where the liner may be damaged by crushed rock or pressure.