This stuff is suppose to be better than bentonite.It is called pond seal.Not sure if I can post a link but here it is.Sorry if links are prohibited.
http://www.aquablokinfo.com/index.php?option=com_content&task=view&id=77&Itemid=171
http://www.prweb.com/releases/PondSeal/AquaBlok/prweb2338304.htm

I clicked on the first link you put up, and to my surprise found one of my own pictures on there site. The picture of the waterless muddy looking pond with a little house in the background. That is my picture took from my website of a pond we put a man made liner in to fix. I just wanted to through that out there because it is my picture. As for the product I don't know much about it.

Interesting Kramerode, I see what you mean the front page of the website above has a cropped version of the photo on your "Pond Liner" tab in your website.

I don't know anything about the products, hopefully one of the experts will weigh in.

Did you ask them where your Royalties check is yet?

I'm sure my check is lost in the mail.

Will have some pondseal delivered in a few days and will keep you posted. Keep your fingers crossed or should I say hands folded.

Keep us posted.How much does the pond seal cost?

ok