Pond underlayment fabric provides dependable protection against punctures to a rubber or PVC liner in pond and waterfall applications. It goes in beneath the liner, so the liner rests on fabric rather than on the rock, gravel and ridges underneath.

A liner does not fail because someone stepped on it. It fails because the weight of the water presses it onto whatever is below, and that load concentrates on every stone and ridge in the excavation.

Needle-punched from 100% polypropylene staple fibers in a random network, it is high strength, dimensionally stable and rot and mildew resistant — which is what allows it to be buried under a pond and left alone. The same fabric also suits heavy rip-rap and boulder retaining walls.