yarlung 10 x 13 ft Pond Liner — 20 mil Black HDPE UV-Resistant Flexible Mat for Medium Backyard Ponds

Yarlung’s 10 x 13 feet, 20 mil black HDPE pond liner is a flexible, UV-resistant waterproof mat designed to form medium backyard ponds, waterfalls and water features while protecting fish and plants.

If you're building or relining a garden pond, fountain, or waterfall and want a reliable, easy-to-handle underlay that blocks soil intrusion and holds water safely, this Yarlung pond liner is sized for medium installations and engineered for outdoor exposure. Made from high-density polyethylene (HDPE), the sheet balances toughness with pliability so it can conform to irregular shapes and shallow slopes without tearing or breaking down under sun or water exposure.

How tough is this liner for outdoor use?

The Yarlung 20 mil liner is manufactured from durable HDPE that resists punctures, UV damage and water degradation, offering long-lasting protection for outdoor water features. It stands up to sunlight exposure and typical garden wear without becoming brittle.

• 20 mil thickness balances durability and flexibility for medium ponds
• UV-resistant HDPE reduces sun-related breakdown
• Puncture- and waterproof construction for reliable containment

Will it fit my pond shape and size?

This 10 x 13 ft sheet suits medium ponds (roughly a 6 x 9 x 1.5 ft excavation) and holds up to about 500 gallons, but it’s easy to trim or fold to match irregular edges and stepped shelves. The material stretches around corners and contours so you can shape basins, slopes and waterfall channels without complex seam work.

• Trim-to-fit design for custom shapes
• Flexible enough for sweeping corners and gentle slopes
• Recommended sizing guide for medium backyard ponds (approx. 500 gallons)

How does this liner protect fish and plants and simplify maintenance?

The black HDPE surface blocks soil and outside contaminants from entering the water column, helping keep your pond cleaner and making routine cleaning easier. Because it forms a stable waterproof barrier, it helps maintain cleaner water for fish and aquatic plants without introducing harmful substances.

• Impermeable barrier prevents soil leachate and contaminants
• Smooth surface is easier to rinse or scrub during maintenance
• Safe for aquatic plants and fish when installed properly

How simple is installation and what accessories help?

The liner’s lightweight, flexible sheet simplifies handling and placement: cut with a utility knife, press into place, and secure edges with underlayment or stones. Use an underlayment layer or sand base to smooth sharp points and improve longevity, and consider edging materials to conceal and protect exposed seams.

• Lightweight HDPE for single-person maneuvers and adjustments
• Easily cuttable for trimming and fitting on site
• Use sand or felt underlayment to prevent punctures and flatten the base

Who is this for? The Yarlung 10 x 13 ft x 20 mil HDPE pond liner is ideal for homeowners, landscapers and hobbyists creating or refurbishing medium backyard ponds, small koi or goldfish habitats, fountain basins and decorative waterfalls. Choose this liner if you want a balance of durability, UV resistance and ease of shaping for custom water features without the heavier cost or stiffness of thicker rubber alternatives. It’s also suitable for temporary installations and seasonal projects where a resilient waterproof membrane is needed.

Key product highlights: 10 x 13 ft sizing for medium ponds, 20 mil HDPE construction, UV and puncture resistance, flexible for custom shapes, barrier against soil and contaminants, and straightforward on-site trimming and installation. Proper underlayment and careful edge protection will extend the liner’s service life and help you maintain a clean, healthy-looking water feature.