Premium-Grade EPDM Pond Liner – High-quality 45 mil rubber liner provides a strong, flexible, and waterproof foundation for ponds, waterfalls, and other water features. Premium-Grade EPDM Pond Liner – High-quality 45 mil rubber liner provides a strong, flexible, and waterproof foundation for ponds, waterfalls, and other water features. Built to Last – Designed to withstand UV exposure, harsh weather conditions, and oxidation for long-term durability, backed by an industry-leading 20-year guarantee. Flexible & Easy to Install – Stretches and contours effortlessly around shelves, curves, and irregular pond shapes, making installation simple for DIYers and professionals. Safe for Aquatic Life – Non-toxic, fish and plant-friendly rubber construction ensures a healthy pond ecosystem with no harmful chemicals or leaching. Versatile Use – Ideal for koi ponds, garden fountains, retention basins, decorative water features, and pondless waterfalls, offering superior water containment.