Effective sealant: Granular sodium bentonite clay is an effective sealant for ponds, dams, and other water bodies. It expands up to 15 times its dry volume when it comes into contact with water, creating a solid, impermeable barrier that prevents leakage. Long-Lasting: Once settled, the bentonite layer remains intact, effectively sealing the pond for many years without the need for frequent repair or reapplication. Versatile: Aside from sealing water bodies, granular sodium bentonite clay also finds use in a range of applications such as in construction, agriculture, waste, and more. Specifications: Material: sodium bentonite Color: light brown Weight: 30 lbs Package includes: 30 LBs granular sodium bentonite clay for pond sealing Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays.