This makes it possible to combine different laundry types like color and white or black and white or heavy stained and light stained to wash them together. First you decide what type of laundry you have most. E.g. White medium stained than you add the other colors and types inside the membrabag to your white laundry. When the laundry is finished you take out your white laundry and put in the other laundry for a special rinse programm. This programm will only take 1 or 2 minutes and give the laundry from the bag its final cleaning.