The best pond liners for natural swimming ponds depend on durability, flexibility, and how well they blend with the environment. EPDM rubber liners are a popular choice because they’re flexible, long-lasting, and resistant to UV rays and temperature changes. Another option is reinforced polyethylene (RPE), which is lightweight, strong, and has a longer lifespan with less risk of punctures.
For a more natural approach, some people use compacted clay or bentonite, which creates a watertight seal without synthetic materials. However, clay is at more risk of leaks and cracking especially in cold weather. Clay liners are also much more likey to lead to seepage. No matter the choice, the liner needs to be safe for aquatic plants and wildlife while keeping the pond’s water level stable.
