Amazon.com : 15 ft. x 20 ft. UnderGuard Geotextile ...
Anjon Manufacturing"s UnderGuard Nonwoven Geotextile Underlayment. adds an extra layer of protection between pond liner and rocky or unstable soils. It stabilizes soil and prevents air voids from forming between the liner and earth; reduces wear and abrasion from rocks and roots and extends the life of pond liner.
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