No Flea Carpet Crystals is a flea killing powder. It is a dry crystal powder that works on the carpet and under the cushions of upholstered furniture to kill fleas. Directions for Use Apply to dry carpet only. Vacuum all carpeted areas prior to applying No Flea Carpet Crystals. By shaking container from side to side lightly sprinkle No Flea Carpet Crystals evenly over entire carpeted areas including under beds and furniture. Any powder visible after application must be brushed into carpet fibers or removed. Please wait at least 5 days and vacuum treated areas. Active Ingredient: 99 Boric Acid