45 mil pond liner is very strong and puncture resistant but it does have its limits.
Pond underlayment carpet.
Using a 6oz thickness of underlayment can improve the punture resistance of your pond liner by 400.
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.
Aquascape non woven geotextile underlayment is used to protect pond liner from rocks roots and other sharp objects that may damage the liner.
Pond underlayment provides additional protection for flexible rubber or plastic liners.
A proper underlayment is considered a non woven geotextile that is a fancy term for saying it is a really tough material that is lightweight and easy to work with.
Pond underlayment has only one job and that is to protect your pond liner.
Walkway driveway patio under paver.
Water is easy to move and replace but beautiful fish and other aquatic creatures are often not cooperative.
Cattle crossing carpet and gravel or dirt access roads.
Rock and boulder padding.
The underlayment is light in weight spreads easily and has a non slippery surface making installation quick and easy.
A medium weight underlayment for soil separation and stabilization in paving and gravel applications.
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.
Liner and underlayment epdm pond liner is extremely flexible and will conform easily to whatever shape pond your desire.