Check into a hotel and boil water and pour it into the toilet immediately

According to the advice of the hotel staff, after checking in, you should use a kettle/electric kettle to boil water and then pour it into the hotel toilet.

If you are sure that you will not use the kettle at all, you can skip it; but if you are likely to use it to boil drinking water or make tea, it is best to follow it to ensure health safety.

We are often advised that when checking in to a hotel, we need to carefully check if there are any recording devices or hidden cameras, check if the bedding, slippers, and towels are clean or not, check if the room phone, TV, and wifi network are usable or not, which is completely normal. But why do we have to boil water and pour it into the toilet?

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