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> Japanese "unit bath" bathroom This is pretty much how bathroom-toilets in Singaporean public housing are designed; the entire floor is designed to 'get wet',

• koliber 4y ago
  When traveling to Japan, we had a bathroom like this. We filled the bathtub with water to wash the kids. When we drained it, water came out of the floor drain and we were afraid it would overflow into the hallway. Works well in theory but in practice we found some flaws.
  • squarefoot 4y ago
    This would happen if something clogged the drain pipe after the intersection of the bathtub drain and floor drain, so that going up the floor drain became the easiest path. Someone before you may have thrown away something that clogged the pipe, but sometimes very hard water, a lot of time and no maintenance can also create limestone deposits that effectively shrink the pipe.