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Answer :
Final answer:
To prevent backflow in a plumbing system, (b) an air gap should be created between the faucet and the flood rim of the sink. This prevents the mixing of potable and contaminated water.
Explanation:
In the instance of preventing backflow in a plumbing system, the correct approach would be option b: creating an air gap between the faucet and the flood rim of the sink. This air gap serves as a simple, yet effective, method to prevent the mixing of potable and contaminated water. Cross-connections (option a) or physical links (option c) between the potable and contaminated water supply could encourage backflow, which is undesirable.
A backflow situation can result in contaminated water possibly making its way back into the clean, potable water supply, and this can be a severe health hazard. Contamination could involve bacteria, harmful pathogens, or even simple sediment.
By way of an air gap, we essentially cut off any direct path from the sink (and the potentially contaminated water therein) back to the faucet and the water supply it is connected to.
For example, if a faucet is located above a sink and the sink becomes filled with dirty water, the air gap between the water level and the faucet prevents that dirty water from flowing backwards and contaminating the clean water supply.
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