The Coriolis effect does not determine which direction water swirls down sinks or toilets because the effect is tiny & masked by other, much stronger factors. However, by eliminating these other factors, water will consistently swirl counterclockwise well North of the Equator and clockwise well South. This phenomenon proves Earth is a rotating sphere.
Flat-Earthers noticed the myth about water swirling down sinks & use it to dismiss the Coriolis effect. In reality, it is only a myth because other factors mask the Coriolis effect. Removing these factors lets us observe the water swirling from the Coriolis effect alone.
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