Here's the breakdown:

* The Coriolis effect DOES influence large-scale weather patterns and ocean currents. It causes moving objects (like air and water) to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

* However, the Coriolis effect is NOT strong enough to noticeably influence the direction of water going down a drain. The size and scale of a drain are too small for the Coriolis effect to have a significant impact.

The direction water goes down a drain is primarily determined by:

* The shape of the drain: A slightly uneven or sloped drain will naturally guide the water in one direction.

* The initial direction of the water: If you pour water in a specific direction, it will likely continue flowing in that direction.

So, whether you're north or south of the equator, the water will go down the drain in the direction determined by the drain's design and the initial flow of the water.