Before installing a pond liner pack some dirt into any voids to create a nice smooth backing for the liner.
Installing pond liner bottom drain.
Make sure liner is properly aligned so that the liner extends over all the outer edges of the pond then cut a 2 inch hole in the liner over the bottom drain opening only.
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Pond bottom drains simply push dirty pond water to the filter and push it back into the pond once it is clean.
It is very important to make sure you have enough liner around all the sides of your pond before you cut the drain in.
An alternative to installing bottom drains is to remove the fish from the pond drain it wash the pond put clean water and then place back the fish to the pond.
The liner is installed as normal but cut out a hole of the geosynthetic around the drain.
Another option is to use expanding foam to fill any voids and provide a smooth surface for the liner.
An x cut is made over the sump of the drain.
Installation guide for bottom drains bottom drain under liner to skimmer and bottom drain above liner to external pump manifold.
Reach in to make sure both the liner and sump are both clean and dry with a rag.