allerySlow sand filters are used for treating what?
ACooking oil
BEngine fuel
CWheat flour
DDrinking water
Answer & Solution
Correct answer: D. Drinking water
1. Recall the idea: Slow sand filters use a biofilm to treat potable water.
2. The correct choice is: Drinking water.
3. The other options describe different methods or properties and do not fit this fact.
_Source: Wikipedia, Filtration_
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