[Razorbet]

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My guess would be that the jet on the bottom of the bowl probably randomly hits these "floaters" sending them to the top of the water surface therefore not being disposed of before the end of the flush cycle.

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I thought the 4 phd's would make sure they could control "random" events in turbulent water?

Water turbulence, much like air turbulence, is extremely tough to predict, even in models like toliets, where the variables are somewhat controlled.

Regards,
Woodguy

edit: chaos theory was developed to help describe meteorlogical systems, and was quickly adapted to help decribe turbulent fluid systems under hydrolic pressure....a toliet would be similar.

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My theory probably explains why I test and record results. Fluid Mechanics is not my strong suit.