Things You'll Need
Instructions
Spread the sand in shallow trays, such as cookie sheets or plastic tubs, so that it's one-half-inch thick. It needs to be thin for the sun to penetrate all the grains.
Place the trays in a sunny spot where the sand will be protected from moisture. Don't put it outside until there are a few sunny days in the forecast.
Bleach the sand in the sunlight for two to three days. Stir it around with your hand and spread it back out once a day.
Leave it out longer to lighten it more. It will not lighten to a bright white no matter how long it sits in the sun.