A garden pond can be lined with either a rigid liner (preformed pond), or a flexible liner.
All pond liners must be fish and plant safe, because of chemicals used in other types of materials such as a pool liner, which will not make a good pond liner.
A flexible pond liner will let you create a pond shape that will fit the landscape and the size or shape that you desire.
There are several types of flexible liners to choose from such as..........
Garden ponds with a unique shape will require a flexible liner even if smaller in size.
Pond underlay is recommended under flexible liners.
A pond liner underlay is a fabric mat that helps prevent small stone intrusion and keeps roots away from your liner.
These preformed ponds are smaller in size with plant shelves built right in.
A preformed pond is very good for displaying aquatic plants or small fish but may not be right for koi fish.