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.
Installing pond liner bottom drain.
Rectangular box welded pond liner insert flexible 168 00.
Use a small paint brush to reach through thehole in the liner and brush away any debris that might have collected on top of the bulkhead flange.
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.
Reach in to make sure both the liner and sump are both clean and dry with a rag.
Place liner in pond.
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.
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The liner is installed as normal but cut out a hole of the geosynthetic around the drain.
Before installing a pond liner pack some dirt into any voids to create a nice smooth backing for the liner.