Answer by
Milette (1105)
A flexible pond liner is best if you are hoping to achieve the natural look. Butyl Rubber, Ethylene Propylene Diene Monomer, PVC and High Density Polyethelene are the most popular materials used for flexible liners. Of these, PVC is probably the best. It's inexpensive and easy to use. It's also very durable and will last for up to 10 years.