Toilet stool units with a washing water squirter; [ disinfectant dispensers for toilets; toilet bowls; ] seatings for use with Japanese style toilet bowls; set units of toilet bowl and seat; [ drying apparatus for industrial purposes; air-conditioning apparatus for industrial purposes; waste water treatment tanks for industrial purposes as part of a water treatment system; ] septic tanks for industrial purposes [ ; household tap-water filters as part of a water treatment system; waste water t...