Product Details Return to Top Overview Cleaning and descaling your Keurig Brewer is strongly recommended to avoid calcium mineral build-up that occurs in most tap water. Mineral deposits in your brewer or espresso machine can extend brew time, clog water tubes, and reduce brew temperature. We've tested a number of products, and recommend Dezcal™ because it's easy to use, and more effective than vinegar. 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. Our recommendations for use: Dissolve one packet Dezcal in 32 oz. of water in your Keurig Brewer's reservoir. Stir thoroughly for at least 30 seconds to make sure entire packet is dissolved. Brew several cycles -- with no K-Cup -- into a mug or heat-safe glass measuring cup until the water tank is empty. Leave your Keurig Brewer on for 30 minutes. At this point you still have the descaling solution in your boiler, where it will continue the descaling process. Rinse and refill your water reservoir and brew several cycles into a mug until the water tank is empty. Refill and repeat, until the water in your mug or measuring cup is completely clear. Your brewer is refreshed and revived, and ready to make a fresh cup of k-cup coffee! WARNING: Harmful if swallowed. Irritating to eyes and skin. KEEP OUT OF REACH OF CHILDREN.