Safe material and build: This heavyduty pond liner is made from density polyethylene (HDPE). It has a thickness of 0.2 mm (0.008 in), and is UV and puncture resistant. It is from plasticizers, making it suitable for prolonged outdoor use in ponds. puncture resistance: At 0.2 mm (0.008 in) thick, the liner is strong enough to lay on rocky ground. It withstands extreme weather, offering durability, tear resistance, and puncture resistance. It stays flexible enough to avoid excessive stiffness or wrinkling, and it resists penetration by sharp rocks or stones. Easy to clean and maintain: The liner provides durable, UV and ozoneresistant performance. It creates a flat pond surface that reduces soil buildup and helps prevent soilborne substances from penetrating into the pond water, making cleaning easier. Wide range of applications: Suitable for fish and koi ponds, water features, retention ponds, fountains, backyard waterfalls, and water gardens. It is also a strong outside option for farm impounding reservoirs. Widely used in construction, agriculture, surface protection applications, covers of various types, tarps, and more. Use scenarios: Build a rockyground backyard koi pond: install this liner to create a durable, longlasting water enclosure that resists punctures and weathering. Create a garden water feature or fountain: lay the liner under a waterfall or decorative pond to maintain a clean, flat surface and protect the water from soil contaminants. Line a farm retention or irrigation reservoir: use the liner for outdoor storage or water impoundment, benefiting from UV resistance and robust puncture protection.