Which direction does toilet water spin exactly at the equator?

If it's true that toilet water spins depending on whether you live in northern or southern hemisphere, then what about exactly at the equator on an equinox? Does it spin one way one time then another just by chance? Is it 50-50? Also if people live at the equator, does the water direction reverse as the... show more If it's true that toilet water spins depending on whether you live in northern or southern hemisphere, then what about exactly at the equator on an equinox? Does it spin one way one time then another just by chance? Is it 50-50?

Also if people live at the equator, does the water direction reverse as the season changes? That does not make any sense what so ever.
Update: If equator is just an imaginary line, then am I just imagining that water is spinning one way above the equator and the other way below the equator??
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