The Science of Pond Liners Your choice of a pond liner is one of the first and most important decisions you will make. We offer only the EPDM liners because they are the BEST quality and longest lasting. Who wants to dig a hole and then have a pond that leaks as the liner degrades over time? PVC and HDPE pond liners are common. They are not desirable for cold climates due to their brittle nature, and direct sunlight can damage them. Butyl Rubber liners are very thick and heavy, though usually durable. However, they can be toxic to some animals and are not suitable for Koi fish. Fiberglass liners are pre-formed, expensive to ship, give no flexibility in design and look often artificial. Concrete ponds tend to grow more algae. They are also laborious, expensive, and they sometimes crack in cold climates. And you can't easily change your landscape later. Measuring for a pond liner:
Pond liner width (at widest part) + 2* Pond Depth (at deepest part) +6"
ie: Width: 12 ft wide x 24" deep pond: 144in + (2*24in) +6in=198in
Pond liner length (at longest part) + 2* Pond Depth (at deepest part) +6"=
ie: Length: 10 ft long x 24" deep pond: 120in + (2*24in) +6in=174in Fish require a deeper pond, particularly if you live in a colder climate. Goldfish require at least 3 feet, and koi or larger fish require 4 feet. | 
