This underlayment is a heavy (6 oz to the yard) synthetic matting. Our Pond Liner Underlayment comes in 12 x 25 ft roll (300 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 12x25 Underlayment?
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