Product Details Return to Top Overview Cleaning and descaling your coffeemaker is strongly recommended to avoid calcium mineral build-up that occurs in most tap water. Mineral deposits in your coffee or espresso machine can extend brew time, clog water tubes, and reduce brew temperature. Regular use of safe, fast-acting Dezcal™ ensures great coffee and protects your machine. Each box includes four 1-oz. packets. Each packet provides a single clean cycle. Recommendations for use: Dissolve one packet Dezcal in 32 oz. of water. Stir thoroughly for at least 30 seconds to make sure entire packet is dissolved. Brew into a mug or heat-safe glass measuring cup until the water tank is empty. Refill and repeat, until the water in your mug or measuring cup is completely clear. Your machine is refreshed and revived, and ready to make a fresh cup of coffee! WARNING: Harmful if swallowed. Irritating to eyes and skin. KEEP OUT OF REACH OF CHILDREN.