Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? Have pond...have leak...need ideas

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Theo is right dig out the area and patch.

If that does not help then you can look at draining the whole pond and starting over with silt removel and fish.

There is a lot of work that can be done with a shovel and a few bags of concrete. At least it could tell us what the problem is.
Keep us posted.