We have a 70sq ft pond with a small feeder pond about 5f above it and a waterfall inbetween.
The waterfall is leaking and needs repair work.
Although I've not investigated fully, I think there is a base layer of matting, then one or two layers of butyl liner and some sort of concrete mix on top. There's then a liberal sprinkling of boulders and "weeds". I know some of the concrete has broken up will need replacing (as opposed to repairing) and I suspect this may be indirectly responsible for the leak.
I believe some concrete type materials are likely to be toxic to fish, and it is going to be difficult to repair the waterfall without getting some in the lower pond. Any suggestions on what to use?
The waterfall is leaking and needs repair work.
Although I've not investigated fully, I think there is a base layer of matting, then one or two layers of butyl liner and some sort of concrete mix on top. There's then a liberal sprinkling of boulders and "weeds". I know some of the concrete has broken up will need replacing (as opposed to repairing) and I suspect this may be indirectly responsible for the leak.
I believe some concrete type materials are likely to be toxic to fish, and it is going to be difficult to repair the waterfall without getting some in the lower pond. Any suggestions on what to use?