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What is the threshold of litres per person per day at which water scarcity is reached?
The average person consumes how many litres of water per day?
Without flush controls, urinals on commercial premises can account for what percentage of water usage?
Using 10 electronic taps with 1.8 litre-per-minute aerators could save how many litres of water within 36 months?
Waterless urinals can reduce water usage by how much?