starman66,

Are you up for an experiment? Cottonseed meal has often been reported to be a successful agent for clearing ponds(for example reference the latest issue of Southern Ponds). The recommended rate is 300 pounds per acre...a lot less than the gypsum....and it is widely available, at least around here.

I'm wondering if you would be willing to try your bucket test again but this time with some cottonseedmeal? It would be an interesting experiment to get a direct comparison. My thanks if you accept the request...no problem if not. Thanks.