What must be maintained between a watering point and a pesticide application container?

• A. An air gap must be maintained.
• B. A barrier fence.
• C. A water-tight seal.
• D. A run-off channel.

Answer: (A)

Preventing backflow into the drinking water supply is what this is about. An air gap between the watering point and the pesticide application container provides a physical separation that stops any liquid from siphoning back into the water line if pressure changes occur. This simple space acts as a fail-safe: even if a pump or hose creates a tendency for liquid to move, the gap prevents contamination of potable water with pesticide residues.

The other options don’t address backflow. A barrier fence protects space access but doesn’t stop liquid from moving between a water source and a pesticide container. A water-tight seal could trap contamination or create a pathway for backflow if not designed and installed correctly. A run-off channel manages spills, not the backflow risk between water and a pesticide container.