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The dilute hydrochloric acid used for disinfection will bind to the moisture in the air and see small droplets.
Floor common? A separate dormitory? The former has no choice but to open the window, and the latter puts a glass of milk in it before going out, and then seals the space, which will slowly get better.
School toilets are flushed to nearby sewage outlets, then to septic tanks, where they converge, and finally to large septic tanks for decomposition.
It's a good idea, and you can also get a rockery or something, which is good.
Not necessarily. For example, if you are a building, the feng shui downstairs and upstairs is also different. You can't judge whether Feng Shui is good or not just based on that little bit of condition.
When you come to Sushui, this is what most schools use.