Larger sizes are available for special order. Liner material is priced by the square foot and is cut from any of these widths to the length you request. Now measure your string. Do this also for the length of your pond. If the hole that has been dug has any rocks, pebbles or roots in it and is not as smooth as a baby's behind a pre-liner or underlayment must be installed to protect the liner.
Commercial underlayment is available.
We do not suggest sand. It shifts underfoot and can render plant shelves useless. Old carpet can also be used. Roll out the underlayment and cut out holes where the bottom drain and other components are to be installed into the liner. The bottom drain, skimmer, induction jets and plumbing must be installed before the liner can be laid.