I just had a pond installed and was wondering what my options were for fish safe sealants. My friend suggested the stuff that they use on pools, but I read that it leaches chemicals into the water that are bad for fish. Any suggestions?
What is it that you want to seal? If it is the rocks around a waterfall? I have used expanding foam. I get mine from a pond dealer and it now comes in black color. I have installed 6 ponds, including my own, and it works great.