I've just built myself a tiny pond and waterfall inside a tiny cave in a
cliff-face in my garden. The rock was very fractured and so I concreted the
base and water-course, but it still loses the water. I have a large amount
of Unibond and wondered if anyone can recommend using it for this job?
I do not want to keep fish or vegetation so that's not a problem.
Any advice appreciated. Chrisssss....... (North Wales, UK)