Insufficient washing of sand grains in a rapid sand filter causes__________________?
Correct answer: A. Mud balls
- A. Mud balls
- B. Shrinkage of filtering media
- C. Air binding
- D. Expansion of filtering media
Explanation
Inadequately washed sand retains fine clay and sludge; during filtration and backwashing these bind sand grains into dense lumps called mud balls. Air binding is caused by trapped air, not by poor washing.
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