The whole family uses the same bathwater.
Modern apartments have only a shower unit. They install a bath only in country houses, and having a bath is a luxury due to very high prices for the water supply. Japanese people take a bath to relax, and all members of a family have a shower before getting in. That is why the bathwater remains clean.
"Japanese people traditionally make snowmen with 2 snowballs, not 3 like the rest of the world."
specially in AFRICA !