45 mil pond liner is very strong and puncture resistant but it does have its limits.
Pond underlayment carpet.
Carpet is sometimes suggested as a pond liner underlay and you might get away with this just ensure that the carpet is a man made fibre such as polypropylene as a natural fabric such as wool will rot over time reducing it s effectiveness as a barrier and leaving the pond liner exposed to danger.
Since patching systems require a clean and dry surface on which to bond a puncture to the liner typically means draining the pond for a repair.
Pond underlayment provides additional protection for flexible rubber or plastic liners.
Using a 6oz thickness of underlayment can improve the punture resistance of your pond liner by 400.
There are many different pond liners to choose from but you should know that 45 mil epdm is the standard for decorative fish ponds here in america.
Cattle crossing carpet and gravel or dirt access roads.
Water is easy to move and replace but beautiful fish and other aquatic creatures are often not cooperative.
Liner and underlayment epdm pond liner is extremely flexible and will conform easily to whatever shape pond your desire.
Heavy duty weed barrier.
Rock and boulder padding.
A medium weight underlayment for soil separation and stabilization in paving and gravel applications.
Walkway driveway patio under paver.
The underlayment is light in weight spreads easily and has a non slippery surface making installation quick and easy.
Garden and commercial landscape fabric.