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Bentonite Clay Benefits, Uses, Side Effects and More - Dr. Axe
Sodium bentonite clay is used as a natural sealant, such as to seal roads, lagoons, landfills and ponds. It has natural swelling abilities, swelling 15-18 times its dry size when combined with water, making it an effective "hole plug." It's also low-cost and environmentally safe because it contains no chemicals, additives or toxins.