16-ounce bottle of H2Old BaseGel, a super-absorbent polymer used as a ballast weight for portable bases. It is an environmentally friendly alternative to sand or water for stabilizing items like basketball goals and umbrella stands. One 16 oz. bottle of BaseGel replaces up to 400 lbs. (8 bags) of sand when mixed with water. It absorbs up to 40 gallons of water, creating a firm, stable, and mold-resistant gel. The resulting gel is freeze-thaw durable and remains stable for more than 7 years.