LLDPE Pond Liner, 15 x 20 ft, 20 Mil, Black

20 mil LLDPE pond liner helps you hold water reliably while creating a safer barrier for fish, plants, and pond structures. Made from tough, flexible LLDPE in a 15 ft x 20 ft sheet, it bends to curves and corners and can be trimmed for custom shapes, including waterfalls. The black finish blends into natural water features and helps keep your pond looking clean and intentional.

• Delivers strong waterproof containment with 20 mil (0.5 mm) thickness to reduce leaks and seepage.


• Resists punctures and tearing with high tensile strength for demanding outdoor pond setups.


• Fits irregular ponds by bending, folding, and cutting to size for waterfalls, shelves, and slopes.


• Supports aquatic life by helping block soil and unwanted substances from entering the water.


• Works for water gardens, fish ponds, backyard waterfalls, aquaculture, artificial streams, and more.

Build or upgrade a fish pond, water garden, or waterfall feature with a flexible waterproof pond liner sized for small-to-medium projects. To make shaping easier, lay the liner in the sun for 10–15 minutes before fitting it into corners and contours. Once in place, add underlayment or protective padding as needed for rocky bases, then fill and landscape. Grab yours today and start planning a cleaner, more controlled pond environment.

• Material: LLDPE


• Thickness: 20 mil / 0.5 mm


• Size: 15 ft x 20 ft (4.6 m x 6 m)


• Color: Black


• Stated lifespan: 10–50 years depending on exposure conditions