The rate of accumulation of sludge in septic tanks is recommended as____________________?

A. 25 litres/person/year

B. 30 litres/person/month

C. 30 litres/person/year

D. 25 litres/person/month

Be the first to comment if anything wrong with this mcq
Your comment successfully submitted!
It will automatically posted after review and approval by our staff member.