Thanks great info.

The drain plug surface has a defect, a tunnel about 5mm in depth into the surface - hence the leak. I've never seen this before. I think filling it is the only option - though i can't imagine an epoxy resting the copper washer squeeze. Any ideas?

Is there a way to inspect for a fungi presnence. Like stick a coathanger in the tank and see what comes out?

If present what biocide is reccomended?

Thanks again.

Paul

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