Which device protects water supply when handling pesticides?

Which device protects water supply when handling pesticides?

• A. Disconnect the water supply
• B. Use air gap or backflow protection device
• C. Use a closed system with no water protection
• D. Increase water pressure

Answer: (B)

Protecting the water supply when handling pesticides hinges on preventing backflow. If water pressure changes or a siphon forms, contaminated pesticide water can be drawn back into the drinking water supply. An air gap creates a physical separation between the water outlet and any potential source of contamination, so backflow cannot occur. A backflow protection device, such as a pressure-vacuum breaker or other approved backflow preventer, provides a similar barrier inside the plumbing. Either approach stops backflow and keeps the water supply safe during mixing and application. Other options don’t provide reliable protection: disconnecting the water supply may stop flow but doesn’t address backflow during use; a closed system without a backflow device still risks contamination if the system is breached; and increasing water pressure can push contaminants back toward the supply.

Protecting the water supply when handling pesticides hinges on preventing backflow. If water pressure changes or a siphon forms, contaminated pesticide water can be drawn back into the drinking water supply. An air gap creates a physical separation between the water outlet and any potential source of contamination, so backflow cannot occur. A backflow protection device, such as a pressure-vacuum breaker or other approved backflow preventer, provides a similar barrier inside the plumbing. Either approach stops backflow and keeps the water supply safe during mixing and application. Other options don’t provide reliable protection: disconnecting the water supply may stop flow but doesn’t address backflow during use; a closed system without a backflow device still risks contamination if the system is breached; and increasing water pressure can push contaminants back toward the supply.