The Miele Reservoir TwinDos 2 is an empty container that you can fill with your own liquid detergent for your whites. The container has a 1.5-liter capacity. When you have a Miele TwinDos washing machine, you never have to dose your detergent again thanks to the TwinDos reservoir. When you put the reservoir on the bottom of your TwinDos washing machine, the appliance will automatically dose your detergent and your clothes will look nice longer. TwinDos washing machines work with 2 different reservoirs; UltraPhase 1 for detergent, UltraPhase 2 for detergent for whites or for fabric softener. Fill the Miele Reservoir TwinDos 2 with Miele UltraPhase 2 detergent or with standard detergent for whites.