13 ft. x 20 ft. puncture and UV resistant liner. 30% lighter than average 20 mil liner, flexible yet durable. Texture slows algae growth and promotes beneficial bacteria. Non-toxic, safe for fish and plants. 1-year limited warranty. Aquanique's 13 ft. x 20 ft. pond skins Pond Liner is ideal for a large pond. Our PVC liners are reinforced with a mesh weave, making it puncture resistant. It is also UV resistant, so the liner will not fade even after hours of sunlight exposure.