Question

which is the best use of activated carbon filters?
a. flushing out sodium
b. killing microorganisms
c. softening hard water
d. removing heavy metals such as mercury

Explanation:

Activated carbon filters are mainly used for adsorbing and removing heavy metals like mercury from water or other substances. Option a: Flushing out sodium is not a typical use of activated carbon. Option b: Killing microorganisms is done by disinfectants like chlorine, not activated carbon. Option c: Softening hard water is done by ion - exchange resins (removing calcium/magnesium), not activated carbon. So the best use is removing heavy metals such as mercury.

Answer:

d. Removing heavy metals such as mercury