What is the shape of the septic tank?

What is the percentage of purification of septic tank effluent?

What is the preferred size of water closet pan?

What is the minimum depth of water seal in floor trap?

What are the masonry chambers constructed at suitable intervals along sewer lines called?

What is the minimum diameter of pipes used for drainage of waste water?

What is the ratio of cement to be used to plaster the drain at the bottom of the camber?

_______ is used below sinks to prevent entry of foul gases.