Leaky, I'm from Terre Haute, IND and sealed my leak with the bentonite by just cutting the bags and pouring in at the dam water level. That has been several months and no more leak. Bought the bentonite at a Well Drilling supplier that sells pumps and accessories here locally. Call a well driller in your area and they will tell you where to buy it or they might just sell it to you, they use it to seal wells they drill. Hope this helps. Cost was $11.00 50lb bag.
PO