VEVOR Pond Skins 20 ft. x 25 ft. Pond Liner 45 Mil Thickness Pliable EPDM Material for Fish/Koi Ponds Water Gardens, Black CTFSMHSEPDM20SZTDV0 - The Home Depot
Install the Firestone PondGard EPDM Pond Liner and underlay from Rock around the Block - Frog Pond - YouTube