Obviously all plumbing that the liner will cover must be installed before the liner is laid. You simply cannot build a good pond without a good liner because it is the skin of the pond and one of the most important components of The Doc's Dream System. The object is for the liner to last 20 years. Run as fast as you can away from preformed ponds. We suggest and use exclusively 45 mil EPDM liner material.
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.