Pond Underlayment is a thick landscape fabric that is used under pond liner to protect the liner from
puncture from rocks and debris in the soil. It is also helpful in root growth not puncturing the sides or
bottom of the pond.
It is stocked in 7.5′ widths and it is sold by the linear foot.
It is often recommended to use some fabric pins to help hold it in place while installing the liner and
pond rock.