Firstly the underlay is carefully placed over and then pushed down into the cavity, keeping the surface as wrinkle free as possible.
Next the liner is unfolded out on top and again gently pulled out evenly.
A hose is placed in and the filling begins! a dechlorinator is added at this point.
As the water level rises, creases will start to appear, these are folded and will flatten out as the pond fills.
When the water is at the top, hopefully the level will be even all the way around.....that's why a spirit level is an important tool in the early stages of construction.
Finally excess liner and underlay is trimmed, leaving about a foot of material all the way around.
Now comes the best bit......getting it ready for turtles!