19) Which pipe system of plumbing work soil and waste pipe are separated?

20) How many chambers are there in a septic tank?

21) What should be the minimum diameter of the connecting pipe in the septic tank?

22) What is the maximum spacing of manhole sewer size upto 0.3 mf?

23) Which type of pump should be selected in order to pump the sewage from a septic tank to the water treatment system?