Each scent comes in a 16 oz. reclosable zip-lock pouch or 16 oz container. Pour the entire pouch of crystals in a decorative glass dish to diffuse into a medium or large room or use a portion for smaller spaces. Stir the crystals occasionally to freshen the scent. For a stronger scent, use the crystals in an oil warmer. These salt crystals will last approx 6-8 weeks.