If you take a morning shower at the voco Brussels City North hotel, the water that you see trickling down the drain as you wash your hair might visit you again later — when you flush the toilet in the evening. However, before that shower water returns to swirl around your toilet bowl and dash, at last, towards the city’s sewers, it will go through a special treatment process enabled by a chain of fridge-like machines in the hotel’s basement. “Every time you flush your toilet, you actually import six to nine litres [of water] into your building,” says Sabine…
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