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UnderGuard Geotextile Underlayment - 10' x 50' - UnderGuard Geoxtextile UnderlaymentUnderGuard Geotextile UnderlaymentUnderGuard Geotextile Underlayment The biggest contributors to Koi pond, water garden and waterfall failures are poor, unstable soil conditions. Simply lay the pieces next to each other and install the pond liner. Use any extra underlayment to create pads for large rocks and boulders placed inside your pond.