1.8 mil (0.12 mm) HDPE Pond Liner — Black Key benefits Keeps water clean and healthy: the black HDPE material blocks soil and debris from entering the pond, protecting fish and aquatic plants. Longterm outdoor performance: UV and ozoneresistant formulation helps the liner withstand sun exposure and weathering. Reliable protection: flexible yet puncture and tearresistant material reduces the risk of leaks and damage during installation and use. Easy to install and maintain: thin, pliable sheet conforms to pond contours and provides a smooth underlayer to reduce soil buildup. What it is Material: Density Polyethylene (HDPE) Thickness: 1.8 mil (0.12 mm) Color: Black Function: Waterproof pond liner / underlay for outdoor fish ponds, streams, fountains and water gardens How it solves common problems Prevents contamination: forms a continuous barrier between water and surrounding soil, stopping dirt, roots and sediments from entering the water column. Reduces needs: puncture and tearresistant properties lower the chance of damage from rocks, tools, or movement, extending usable life. Simplifies finishing: provides a flat, stable base so decorative layers (rounded pebbles, sand, or aquatic planting media) sit evenly and protect the liner from surface abrasion. Practical use and compatibility Underlay for backyard fish ponds: use beneath decorative rock or gravel to protect the waterproof liner and keep fishsafe water. Lining small streams and waterfalls: conforms to uneven surfaces for a watertight channel and helps maintain clean flow for plants and fish. Waterproofing fountains and water gardens: use as a primary liner or protective underlay beneath planting pockets and pond edges. Installation tips (simple, effective) Prepare the area: remove sharp rocks and roots before laying the liner for results. Use a protective layer: place a layer of rounded pebbles, sand, or a commercial underlay on of the liner to reduce wear and extend service life. Allow overlap at seams and edges: ensure sufficient coverage for secure placement and easy anchoring. Performance highlights Durable, flexible HDPE resists cracking and deformation. UV and ozone resistance for outdoor longevity. Puncture and tearresistant for dependable waterproofing. Suitable applications Outdoor fish ponds Garden streams and waterfalls Decorative fountains and water gardens This 1.8 mil (0.12 mm) HDPE pond liner is a practical, dependable choice when you need a lightweight, flexible, and weatherresistant barrier to protect water features and the life within them.