Zanussi's SID dispenser
This seemed like a good idea, but was truely dreadful. The intensive wash at 70 deg C, had a heated prewash that required additional powder to be added to a second dispenser in the upper basket. This dispenser received the water jet from the ceiling of the interior as usual, but had a revolving 'saucer' if you will.
The water was supposed to flush the powder into solution. However, the SID dispenser had a bayonet type 'twist & lock' upper portion, and detergent residue became trapped in the area where the two main parts mated together. I ended up modifying the bottom of the top section, by cutting several small notches to allow some water to flush the trapped detergent out. It was a very poor design and was very bulky in size. The second version was a lot smaller, but suffered the trapped residue problem (white streaky leaks at the end of the cycle).