PondSeal is an all natural product that can be used as a water containment membrane (compacted or pure layer) in stock ponds, sewer lagoons, landfills, irrigation canals and cut-off walls, decorative garden ponds, etc. PondSeal’s bentonite clay sealant can expand 15 times or more when exposed to moisture making it an ideal choice for sealing ponds.
Unaltered high-swelling sodium bentonite.