Question

What is the main purpose for the presence of water in a toilet bowl (Western Commode/Water Closet)?

• A. To prevent back flow of sewer gases.
• B. To efficiently flush solid, semi-solid fecal matter.
• C. To regulate water temperature in plumbing lines.
• D. To neutralize acidic waste materials.

Hint:

In plumbing systems, water in the toilet bowl acts as a seal to block sewer gases from escaping. This is why the water level is always maintained in the toilet trap.

Answer 1

The Correct Option is A

Step 1: Understanding the role of water in toilets.
The primary purpose of water in a toilet bowl is to create a barrier that prevents the backflow of sewer gases into the living space. The water acts as a seal in the toilet’s trap, keeping harmful gases from escaping.
Step 2: Analyzing the options.
(A) To prevent back flow of sewer gases: This is correct. The water creates a seal in the toilet trap to prevent sewer gases from entering the room.
(B) To efficiently flush solid, semi-solid fecal matter: While water helps with flushing, its primary function is to prevent gas backflow.
(C) To regulate water temperature in plumbing lines: This is incorrect as the water in the toilet is not intended to regulate temperature.
(D) To neutralize acidic waste materials: This is incorrect, as the water's main function is not to neutralize waste but to prevent gas backflow.
Step 3: Conclusion.
The correct answer is (A) because the water in the toilet serves to prevent backflow of sewer gases.