An operator notices that the water clarity in a pool with a sand filter is poor, despite the pump running and normal pressure gauge readings. Upon inspection of the filter tank's interior, they observe deep grooves or pathways in the top layer of the sand. What is this condition called and what is the primary consequence?
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A
Calcification; it hardens the sand and prevents backwashing.
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B
Mud-balling; it creates clumps that block water flow and increase pressure.
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C
Channeling; it allows water to bypass the filter media, reducing filtration effectiveness.
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D
Sub-stratification; it causes different layers of sand to mix, requiring immediate media replacement.