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In general, flushing toilets does not require a lid.
Unless the toilet is full, or the flushing system is faulty, and there is a fear that the feces and water inside will splash out, you need to cover the lid.
This is because toilet flushing creates an instantaneous cyclone, leaving liquid or solid particulate suspensions in the air that can remain for up to several hours and land on walls and objects. >>>More
I think it's the same whether you flush the toilet seat or not, but some people said that the reason why it must be closed is not very good.
Be sure to cover it, otherwise bacteria may get into the air, especially on your toothbrush.
You don't need a lid on this...
Originally, there was not much water to flush, and the vacuum suction was so strong that those small water molecules couldn't fly to your mouth at all. >>>More
It is best to close the lid when flushing the toilet.
That's fine. Avoid splashing water droplets. >>>More