Building a natural pond without liner is possible, but it depends heavily on soil type, climate, and long-term expectations. Clay-rich soil can sometimes retain water, allowing a liner-free pond to function naturally. However, in many areas—including Perth—soil often contains sand or loose material that causes water loss and erosion. Without a liner, maintenance can become costly and unpredictable. Using a fish safe pond liner, such as EPDM or HDPE, provides reliable water retention while still allowing a natural appearance. Liners prevent leaks, protect aquatic life, and significantly extend the lifespan of the pond.
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