How do you prevent back-siphoning of pesticide back into the water supply?

How do you prevent back-siphoning of pesticide back into the water supply?

• A. Keeping an air gap or using anti-siphoning devices on garden hoses
• B. Using only bottled water
• C. Diluting with more water before use
• D. Pouring backward into water supply

Answer: (A)

Back-siphoning happens when water pressure in the supply line drops and contaminated water can be drawn back into the drinking water system through hoses or connections. The way to prevent this is to create a physical break in the path that could allow siphoning: an air gap or an anti-siphoning device. An air gap means there’s a vertical space between the end of the water outlet (like a faucet or hose connection) and the receiving container or drain, so water can’t be drawn back into the system. For garden hoses, installing an anti-siphoning device or vacuum breaker on the hose bib adds a break in backflow, stopping siphoned liquid from entering the water supply. This approach directly stops backflow and is especially important when hoses might contact pesticides. The other options don’t address the risk of backflow: using bottled water isn’t a preventive measure for backflow through a hose, diluting with more water doesn’t stop siphoning, and pouring back into the water supply is dangerous and would contaminate the system.

Back-siphoning happens when water pressure in the supply line drops and contaminated water can be drawn back into the drinking water system through hoses or connections. The way to prevent this is to create a physical break in the path that could allow siphoning: an air gap or an anti-siphoning device.

An air gap means there’s a vertical space between the end of the water outlet (like a faucet or hose connection) and the receiving container or drain, so water can’t be drawn back into the system. For garden hoses, installing an anti-siphoning device or vacuum breaker on the hose bib adds a break in backflow, stopping siphoned liquid from entering the water supply.

This approach directly stops backflow and is especially important when hoses might contact pesticides. The other options don’t address the risk of backflow: using bottled water isn’t a preventive measure for backflow through a hose, diluting with more water doesn’t stop siphoning, and pouring back into the water supply is dangerous and would contaminate the system.