A lot of great coffee is spoilt by poorly cleaned coffee machines and coffee-servers. Sour and bitter coffee is often due to fat and residue from coffee and water has clogged the thin pipes inside the coffee machine. This can leave a bad taste to your coffee, and shorten the life expectancy of your coffee machine. It is recommended to clean the machine after 100x brewing (1 pack of filter). Fill the container with lukewarm water. Add one bag of Clean Drop and start the coffee maker. After about one minute you turn the coffee maker off. Leave it for a few minutes for the solution to work properly.Then you turn the machine on again. Clean the pot and filter holder with the solution. Run clean water through the coffee maker a couple of times. Content: 5 bags