The entire pond was built/dug with scrapers. I thought I had read on here somewhere that scrapers would give 100% compaction?
If we did proceed to drain it, the bentonite is already in the bottom now, so we could till and compact it...
That polymer stuff isn't cheap either. $250 for 15 pounds. I believe the guy told me to apply it its just broadcast over the pond. If you look at the label, the recommended amount is based on the turbidity of the water, which I found odd. The guy said the polymer attaches to particles in the water and brings them down to help seal...
In the pic of the bottle above, he sprinkled a little bit (think pinch of salt} in the water, then poked a hole in the bottom side with a knife. Sure enough after a minute or 2, it quit leaking and was holding fine....
I did the same thing with some bentonite and a plastic cup, although I had alot more bentonite in the cup than he used of the polymer...