I now understand, but using pond dye, in a very small dosage located at where you are pretty sure the leak is should produce results you desire. My brother used regular pond dye in that area where he thought it was leaking to produce similar results. I would stick with pond dye for three reasons. First it is designed for ponds. Second, when applying it to a specific area it will allow you to see where water movement is occurring. A quart of pond dye should cost around $20.00 if you start getting into making your own you may not be able to mix something that cheap. I think it would take a lot of food grade dye for you to recieve desired results.
