Bob, thanks for the info. I hope I am only losing that much. My pond is 7 mile east of Van Alstyne, where I hope to build a house with the pond as part of the aesthetics. Lovely view...but not of a dry hole. If it doesn't hold water in the long run, I hope POND BOSS can help me fix it. I am a retired coach, so I don't have thousands to spend on it or the divorce that would follow. Thanks again! Great magazine and web site!