I have just been given one of these and can't make out how it works at all.
The door has a furrow to put powder in and when switched on it first runs for a while and then pumps out the water,which is cold.
It then refills and washes again before pumping out warm water,it refills again and runs till it pumps out very hot water.
From what i can see the powder is obviously pumped out with the cold water after the first stage so can't be doing anything.
If i use a tablet instead of powder it lasts long enough to make it to the last stage without dissolving fully and so gives a good wash.