Descaling Tablets- Your coffee system will, eventually, build up calcium deposits within its tubes and chambers. Depending on the hardness of your water you will need to descale your machine after every 500 - 1000 cups. The Descaling Tablets come in packages of six and are a necessary maintenance item for your CVA 2650. Pipework Cleaning Agent- Milk pipework cleaning agent for Miele coffee systems, contains 100 cleaning packets.