I filled this with water, and the fill opening is only part way up the side of the stand. So, I put as much water in that I thought was needed to make it heavy enough. But, then the water leaked out until the level got below the fill opening. It seems like it will be heavy enough with that smaller amount of water in it, but time will tell. Overall, though, I think this is a very nice product. It has an extra support tube for the umbrella, 3 "gasket" sizes to accomodate different diameters of umbrella poles and tightening screws to hold it all in place. I would buy again. And the color is great, I got 2 in the bronze color and they match my furntiture perfectly.