I've spoken by phone several times with Donnie Manns, the owner...or owner's son. Great guy. Good products.
I was a little concerned about how the bags would fare eight - fourteen feet below the Mississippi. But when I received the bags I felt better. They are made of tough stuff. And their bonding process looks near bullet proof.
When I pulled the lift I felt better. Other than a little staining from river muck, the bags are fine. I ordered two when one would handle the load...just to have a back up. I placed them 5' apart at the end of a 40' (4X10' sections) to ensure end lift if one leaked.
Next year I'll move one bag about 25' forward so the whole thing floats near level, making maneuvering the 40' back parallel to shore easier. ....river current and the shore end is a little heavy for my old body.
PS: If you're OK with it, PM me with your name. I'd like to get Kudos from Donnie for kinda sending business his way.