What is the consequence of not maintaining an air gap during pesticide filling?

• A. It has no effect.
• B. It can lead to backflow or contamination of the water supply.
• C. It improves safety.
• D. It only affects indoor water.

Answer: (B)

The main idea here is backflow prevention. An air gap creates a physical separation between the filling vessel and the water supply, so even if pressure changes or a siphon occurs, contaminated liquid cannot be drawn back into the potable water system. If you don’t maintain that air gap, backflow can occur, and pesticide solution could be drawn into the drinking water supply, contaminating it and posing health risks. That’s why the consequence is backflow or contamination of the water supply. The other options aren’t correct because removing the air gap does have a safety impact, it does not improve safety, and backflow can affect the overall water supply, not just indoor water.