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I don't know, you don't have a photo or anything, it could be an electric water heater, a fan, or something.
A method was taught in the TV show, use a small beverage bottle, add less than half a bottle of 84 disinfectant to it, and prick some small holes in the upper part of the bottle, and put the bottle in a place where small insects are easy to infest, such as the drain. My family has tried it and it works very well.
It should be a type of springworm, which is a non-insect hexapod of the order Springtail
It's disgusting to look at, but it's also easy to get rid of, and the landlord can find some quicklime and sprinkle it in the toilet pit
Your home sewer, toilet clogged when the pump is used.
How can there be such a bug?
Send a picture to see, what kind of bug is it, where did it crawl out? >>>More