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What is a cross-connection?

  1. Link between two different types of water filters

  2. Physical link between safe water and dirty water

  3. Link between two refrigeration units

  4. Pathway for sanitizing chemicals through supply tubes

The correct answer is: Physical link between safe water and dirty water

A cross-connection is a physical link between safe water and dirty water. This connection can potentially contaminate the safe water supply with harmful substances or bacteria from the dirty water source. It is crucial to identify and eliminate any cross-connections to maintain the integrity and safety of the water supply system. The other options provided do not accurately define a cross-connection in the context of water safety and cleanliness.