Here you are another video I forgot onto the memory card of my digicam...
It shows how the main wash start filling the washer: first the cold water into the prewash compartement, then the timer advances and go the hot (together with the cold too) into the wash compartement...
Incredible even with the worst quality of powdered detergent the dispensers are sparkly clean at the end of any cycle!
What's interesting to me is, that's almost exactly how the dispenser on the GE Harmony works! Good ideas never die; they just go on vacation for a while.