To prevent back-siphoning when filling a spray tank, the end of the water hose should be kept below the surface of the tank mixture.

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Multiple Choice

To prevent back-siphoning when filling a spray tank, the end of the water hose should be kept below the surface of the tank mixture.

Explanation:
Back-siphoning happens when liquid from the spray tank or its contents can be drawn back into the water supply through the fill hose. To prevent this, you want an air gap between the liquid and the supply line, which is achieved by keeping the end of the fill hose above the surface of the tank mixture. When the hose end is submerged, a siphon can form and pull liquid back into the water source, risking contamination. So the correct practice is to keep the hose end above the liquid surface, not below it.

Back-siphoning happens when liquid from the spray tank or its contents can be drawn back into the water supply through the fill hose. To prevent this, you want an air gap between the liquid and the supply line, which is achieved by keeping the end of the fill hose above the surface of the tank mixture. When the hose end is submerged, a siphon can form and pull liquid back into the water source, risking contamination. So the correct practice is to keep the hose end above the liquid surface, not below it.

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