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Granular Bentonite for Pond Sealing - 2,000 lb Bulk Sack $1,175.00 - $1,475.00Granular Sodium Bentonite Clay for ponds One 2,000 lb sack = 28 cubic feet = 1.04 cubic yards Bentonite clay is a natural expanding clay sealant that when exposed to moisture can expand 15X or more creating a very effective pond sealant...$1,175.00 - $1,475.00