Use a colander; the plastic type used to wash vegetables and which can be bought at markets or the shops selling pails, brooms, etc. Make sure the holes are smaller than the size of the gravel you are washing. There is a type where the holes/openings are thin slits. These are not round-bottomed like bowls but flat-bottomed like the steamers.
If you have a lot, wash bit by bit under running water.
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