Put the mixture in water to dissolve the sugar, then depending on how coarse the gravel is filter the undisolved mixture to separate the gravel and sand.
Put the mixture in water to dissolve the sugar, then depending on how coarse the gravel is filter the undisolved mixture to separate the gravel and sand.
Put the mixture in water to dissolve the sugar, then depending on how coarse the gravel is filter the undisolved mixture to separate the gravel and sand.