Co-Authored By:
Hereof, how thick are pond liners?
For larger ponds with rubber liners, 40 ml and even 45 ml will work well and last for years. Synthetic plastic liners are usually sold in 20-40 mil thicknesses for home use. 40 is better but 20 or 30 may be just fine in some instances.
Then, what pond liner should I use?
The most common types of liners for garden ponds are PVC and rubber pond liners such as Epalyn (EPDM) and Butyl. Overall, we would recommend a pond liner made of rubber, which is durable, flexible, moderately inexpensive and easy to work with because they last for decades.
Today, pond liners made of reinforced polyethylene (RPE), ethylene propylene diene monomer (EPDM), and high-density polyethylene (HDPE) are available.