I didn't see a MSDS sheet for this product but they claim it is 100 percent fish safe if thats your concern.
I looked at that AquaBlok product and i'm almost certain it will be expensive. Have you checked prices on it yet? I'm not a big fan of any bentonite product as I have heard so many mixed results on it. Trust me I feel the same way you do. I too have been looking for a leak solution for over a year now and it's really the main reason I joined the Pond Boss Forum. It does seem too good to be true but I have been feeling lucky lately so we'll see?? I went down to pond and weed eated the banks down to bare soil this afternoon to prepare it for treatment next week. The fact such a thick stand of grass was growing on banks tells me there probably isn't alot of Clay there since grass doesn't tend to grow in it but i'm still crossing fingers... Stay tuned!
