Our innovative engineers took the same heavy gauge material most often used for roofing and other major construction projects and processed it to remove toxins and made it environmentally safe for water gardens. The 45mil EDPM material is extremely strong and ideal for ponds. Our EPDM liner is popular with commercial landscape designers because of its flexible quality and durability. This liner is a good choice for regions with cold climates that require water depths to be 18 inches or deeper. It'™s resistant to harsh weather conditions, UV penetration, and algae growth. The strength of our EPDM liners makes it the right choice. If you'™re working on large projects that have concrete or stone walls in the pond'™s foundation you'™ll appreciate the strength and durability of our EPDM liners. This long lasting liner comes with a 20 year warranty.