The overflow rinse was probably added as a marketing feature to compete with other machines touting lint removal. It was far more effective with the machines that had some variation of the original pulsator which had a ring at the top of the agitator that sent waves of water across the top of the tub and out the holes at the top whereas the space capsule jet cone agitator only had 4 holes at the top of the top cone with nothing to direct the water sideways instead of just up which mainly contributed to rusting in the channel of the lid. Print ads for this new agitator showed the water jetting sideways out of these holes, but something possibly was removed from the original design of the agitator before it was put into production. I tried putting a yellow Lint Chaser Ring over those holes in the Jet Cone agitator, but I do not remember it making any monumental difference. The more deluxe machines had a longer gasket in this channel to reduce water noise while the cheaper machines had a gasket that went across the narrow ledge with the indentation for lifting the lid and about 3 inches running down each of the front and back edges.