I seen a vid of dry sand being dump in the base of bob and i must say they way looks so wrong cus the dry sand gets stuck at a point and has to be push in smh im not with all that bs. I want that hour glass sand meaning i want sand to pour in to the base of bob like water.
In that case, try your local craft store like Michaels, Hobby Lobby or AC Moore and ask for vase sand.
Or use water. Nothing pours like water as much as water does.