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How much can a 40-square septic tank use?

Over 80 people. According to the data of 40 septic tanks, 40 septic tanks can be used by more than 80 people. The dimensions of 10 septic tank are: 7.4m long, 3. 1 m wide and 2.0m deep. It is a four-compartment septic tank with an effective volume of 40 cubic meters, which can be used by more than 80 people.