system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Minimum Brick wall thickness of septic tank should be?
assistant
The correct answer is  Ans. is 'b' i.e., 9 inches"Wall built out of brick should not be less than 200 mm thick and should be plastered to a minimum thickness of 12 mm inside and outside with cement moar not weaker than 1:3; where are built out of the stone masonary.A septic tank is usually provided with brick wall in which cement moar thick and the foundation floor is of cement concrete 1:2:4.