pond const
If your planning a 55 gl. barrel pond definitely need to line it, water and wood does not mix, some people even use a 40 gl. drum [plastic] to insert it into the 55 gl. to resolve the problem of leakage.
I myself have a 500 gl. [tinaco] with kois, and a small pond in my parents home, if you want pics pm me and I'll send it to your email [I still dont know how to insert pic]
best of luck
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