How do I go about tracing where I'm losing water. I've rented a pump and gone from the first level all the way to the top and still can not find the source of my water loss. I do know one thing and one thing only....the pond is not losing water. It will maintain it's level. I'm frustrated and confused as to why......I did everything the book said..LOL Any good ways of tracing water loss????? It is losing about 4" a day. That would be about 5-6 bathtubs. I've attached a picture so you can see just what I'm dealing with.