Complete Aquatics Liner Underlayment

A 6-ounce density provides a robust, puncture-resistant barrier that protects your liner from sharp rocks, roots, and shifting soil. It is thick enough to offer significant protection while remaining flexible enough to conform to the contours of your pond excavation.

The 'hippo effect' occurs when trapped ground gases build up beneath a pond liner, causing it to bubble or bulge upward. This underlayment is permeable, allowing those gases to escape safely rather than pushing against the liner.

Yes, the material is easy to cut to your specific dimensions using a heavy-duty utility knife. You can overlap the sections if your pond design requires a wider footprint than the 12.5-foot roll width.

While soft soil is less risky, underlayment is still highly recommended to prevent long-term friction and stretching caused by the weight of the water. It acts as a protective buffer that extends the lifespan of your liner regardless of your soil type.

You generally do not need to glue or fasten the underlayment to the ground. Simply lay it out, smooth it against the contours of the pond, and place your liner directly on top; the weight of the water will hold everything securely in place.