1.8 mil (0.12 mm) HDPE pond liner underlay for outdoor ponds, streams, fountains and water gardens Thickness and material Thickness: 1.8 mil (0.12 mm) Material: HDPE Color: Black Function and compatibility Pond liner underlay that provides a flat surface for garden ponds Suitable for outdoor ponds, streams, fountains and water gardens Waterproof and designed to protect pond interiors Key benefits Durable and flexible for various outdoor environments UV resistant and ozone resistant for longterm exposure Puncture and tear resistant to withstand site conditions Protection for pond life The black liner helps prevent soil dirt from entering the pond, contributing to a safer environment for fish and plants Ease of use and longevity Reduces soil buildup under the pond installation A layer of rounded pebbles on of the liner will extend the life of the pond Practical use scenarios Backyard fish pond or koi pond: provides a stable underlay, reduces sediment intrusion, and supports pebble protection on Garden stream or waterfall feature: flexible enough to fit contours while maintaining a waterproof barrier Decorative water garden with fountains and plant beds: serves as a durable base that helps protect the pond while allowing decorative pebble layers