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Toilets on trains (at least in Germany) work that way. Presumably because it cuts down on the amount of water necessary to flush, but may have other benefits as

by ygra 4y ago

Toilets on trains (at least in Germany) work that way. Presumably because it cuts down on the amount of water necessary to flush, but may have other benefits as well.

chasil 4y ago
...as do the facilities on commercial airplanes.