Filter Flo mini basket/filter at garage sale FL

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That type of filter pan with the depression in the middle went with the "Straight-8" agitator (4 top vanes + 4 bottom vanes). That is no guarantee, however, that these parts haven't been mixed and matched.
 
I always thought the indent of that type of filter pan was to capture the fabric softener from the dispenser, as not to drop right on the clothing, but rather wait until agitation begins, and the softener is mixed with the filter flo water...

for as with the Jet-Swirl dispenser of the standard capacity, there was a chamber inside that unit which held the softener until agitation began...
 
It was primarily for that short-lived dry detergent dispenser designed for use with the Pre-wash cycle where the "Jupiter-2" space-ship shaped top would drop, after the 1st spin into the depression in the big filter pan. The dry detergent would sit there until the Filter-Flo recirculation would take it for the Main wash. They replaced all this with the "Dispensall" lid by the late Seventies.

We had one of these machines so I can tell you it worked, but it was a little absurd when you compare it to the Kenmore detergent dispensers.
 
While working on my recirculating Maytag modification concept, I did some research on the GE Filter-Flo pans.

The patents in particular make for an interesting read. US Patent #US3197981A, from 1963, describes a filter pan with the stepped design, describing how the lower area and the differing surface speeds of the water flow over the two zones can improve the capture of fine sediment - particles that would normally either pass through or clog the holes of a normal filter designed for lint. The concept was that sediment would be collected in the lower center of the pan, while lint would continue to be collected on the outer part, balling up as usual from the motion of the agitation.

Note however that this patent describes this second zone as having perforations, of a much smaller size than the outer section. It could be that they deemed these either unnecessary after testing, or impractical for mass production?

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