This underlayment is a heavy (6 oz to the yard) synthetic matting. Our Pond Liner Underlayment comes in 12 x 12 ft roll (144 sq. ft.). It should be placed under the pond liner, when a pond is being installed. Pond Underlayment is a geotextile material used to protect the liner from roots and rocks.
Questions about the 12x12 Underlayment?
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