Granular Sodium Bentonite Clay for Pond Sealing - Natural Soil Clay Pond Liner 25 Pounds - Blend of Chips and Powder - Use for Pond Leak Repair & Dam Sealer

Used this as a slurry coat with concrete on a concrete pond. It worked well but milked the water a lot. Put a dirt coat on the surface. Resolved the issue. It did a very effective job on the fixing the leak.

This product has really helped my leaking pond. Even though I added it with water in the pond, it has made quite a difference. Easy to use and effective.

Decent sealant for my pond leak. Granular sodium bentonite helped slow the pond leak, but required more quantity than expected. Works better for smaller leaks, I think. Still, a helpful natural solution. 3 stars

this bentonite worked pretty well to slow down water escaping from pond thru narrow gaps in very old stone. good for now, hoping it holds during winter and spring water gushing over from the creek. This stuff is awfully expensive for a basic /temporary fix. included video of wall that creek/pond are rushing thru and over

worked well to fix a pond leak

Did not work

I used it for my pond leak. It’s cool no complaints

Works as advertised