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Andy gave the correct answer and after checking the reference doc you suggested I am convinced that his answer was right. However without this confirmation, I might have chosen one of the other answers, i.e. habitaciones and not inhabitants. Thanks to all. 4 KudoZ points were awarded for this answer
Explanation: This plant can treat sewage (or grey) water at a rate between 200-250 liters (52-65 gallons) per house per day. Obviously the total capacity depends on the number of houses in the network grid leading to the plant.
Luis Luis United States Local time: 02:52 Native speaker of: Portuguese PRO pts in pair: 171
250l per inhabitant per day
Explanation: I suppose it's talking about the treatment plant's functional capacity to process water at the rate of up to 250 litres per inhabitant (of the area of influence or service area)per day.
It's just a suggestion as tere isn't a great deal of context facilitated.
Andrew Clarke Local time: 09:52 Native speaker of: English PRO pts in pair: 7