One switch beside the center part which is used to fill water or sand, could make this patio umbrella stand more sturdy and increase the weight support capacity, it can be weighed down with up to 55 pounds of sand or 19 liters of water, or empty it out for a lightweight stand that can be taken anywhere. The base does not include water and sand. Do not fill with water at or below 32°F to prevent freezing and cracking.