When you are dyeing textiles, hard water can cause unwanted streaking or uneven swaths of color. Eliminate surprises with Calgon! The water softener keeps calcium and other minerals in suspension so that they cannot interfere with your dyeing process. Details: 16 lb. (.45 kg) bag Suspends minerals and softens waterInstructions: Use 1 cup (.23 kg) Calgon per washing machine load when dyeing in washing machine Use 1/4 teaspoon (1.25 g) per 8 fl. oz. (.24 L) dye solution in dye bathCaution: Keep dyes, paints and chemicals away from children. Avoid unnecessary personal contact. Do not take internally.