Why does the toilet spiral when flushed?

Research has proven that this "vortex statement" is a fallacy. At the Equatorial Tower in Quito, the capital of Ecuador, there are also performances on both sides of the equator where the currents rotate in diametrically opposite directions. The performance seen on TV should be obvious if it is far away from the equator, and the performance on both sides of the equator makes people suspicious, and the following is a paragraph from an article I saw yesterday, which makes sense.

Does the rotation of the Earth cause the vortex of water in the Southern Hemisphere to rotate counterclockwise?

When a flush toilet flushes, the water flow creates a vortex that drains down the drain space. It has been theorized that in the Northern Hemisphere, the vortex is clockwise; In the Southern Hemisphere, it rotates counterclockwise. And the reason for this phenomenon is due to the rotation of the earth.

In fact, the role of the Earth's rotation is very weak, so it is difficult to influence the direction of water flow. You can easily verify this in some washrooms, whether counterclockwise or clockwise, and the direction of the vortex depends on the structure of the sink, not the northern and southern hemispheres.

A group of pigs' brains are flooded, let me tell you, because the new toilets are designed to be whirlpooled, so that the flushing effect is good, it is a popular style now, of course, the price is more expensive than ordinary toilets.

Because of the rotation of the earth, when the toilet is pumped, part of the water flows down, and the other part of the water comes to replenish to maintain the level of the water surface, and the rotation of the earth deflects the flow direction of the water that comes to replenish (to the right in the northern hemisphere).

It's because of the geostrophic deflection force, the northern hemisphere to the right, the south to the left.