I requested a MSDS sheet from pond doctors but never got it. In the end, I wanted my leak fixed so bad that I went ahead with out it because they assured me that the DB-100 product was safe. You may want to request a MSDS sheet as I was told that they do have one.
I've ate fish from my pond since the application of the DB-100 and didn't have any problems. But, that doesn't mean that I might find myself constipated later on : )
Are you sure you are leaking water through the dam and not under? If you have access to a soil auger you could take some core samples and try to locate the seepage. May make a difference on how you attack the problem. Also, if you find water in the dam you can setup a monitoring well.
