Betonite is available from very fine power to coated gravel. I concur with advice, continue filling the pond look for leakage or wet spots. Best long term fix would be draining applying bentonite working it into the top layer and compacting with preferably a vibratory sheepsfoot roller. Worst case bentonite would have to be applied to the entire pond bottom. As Rainman mentions fixing a leaky pond can cost more than building it which is why it is very important to choose a well experienced and qualified pond builder who will guarantee his work.
Last edited by Bill Cody; 03/01/15 03:47 PM.
