EMPA: As the rainwater storage on the rooftop only covers drinking water usage, grey water treatment and recycling is implemented, as shown in Fig.3. Including shower, dishwashing and toilet flushing a total water use for 2 persons is calaculated to be about 105 L/d (including 18 L drinking water) (see Table 1). As black water (from toilet flushing, 15 L) is collected in a separate black water container, the grey water treatment has to be able to cope with about 90 L/d.
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