This fossilized skeletons of tiny aquatic organisms. When untreated, the razor sharp edges of this mined product scratch the exoskeletons of hard bodied insects, making them susceptible to fatal attack from natural organisms in the soil. Application rate: Dry: 1 lb. per 500 sq. ft. Solution: 2 tbs. per gal. of water. As a food supplement for pets: 1-2% of food volume.