The rate of accumulation of sludge in septic tanks is recommended as

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Question:The rate of accumulation of sludge in septic tanks is recommended as

1.30 litres/person/year

2. 25 litres/person/year

3.. 30 litres/person/month

4.25 litres/person/month.

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  1. The rate of accumulation of sludge in septic tanks is recommended as
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