Answer
Do I need a liner for a pond?
Most use a flexible EPDM liner; concrete suits formal or large ponds, preformed the smallest.
In short
Most garden ponds use a flexible liner, usually durable EPDM, which suits natural shapes and is reliable and cost-effective. The alternatives are a concrete build for a formal or large pond, or a preformed unit for a small one. We choose the construction to suit the pond and the ground.
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