Best liquid detergent system in an instantDispensing completely automatically – TwinDos offers 2 options: you either add liquid detergent or fabric conditioner to the Miele refill containers (optional accessories) or you use Miele's 2-phase system. For maximum efficiency, TwinDos dispenses UltraPhase 1 and UltraPhase 2 at the appropriate time in the process. TwinDos plus the 2-phase system achieves the best performance and offers the best liquid detergent system on the market instantly.