Whether you need a pond liner for a natural swimming pond depends on your soil type and how well it holds water. If you have dense, compacted clay soil, you might get away without one since the ground can naturally retain water. But if your soil is sandy or porous, water will seep away too quickly, making a liner a smart choice.
Liners help keep water levels stable and create a reliable base for the pond’s ecosystem to thrive. Some people prefer natural options like compacted clay or bentonite, while others go with flexible rubber or synthetic liners for a long-lasting seal. The key is making sure your pond holds water effectively so plants, beneficial bacteria, and wildlife can do their job in keeping everything balanced.
