One benefit of softening water

• A. Removal of iron and manganese
• B. Increased scaling in pipes
• C. Lower conductivity
• D. Lower total dissolved solids

Answer: (A)

Softening water primarily removes hardness-causing minerals like calcium and magnesium, which helps prevent scale buildup. In processes that use lime softening, raising the pH causes any dissolved iron and manganese to oxidize and form insoluble compounds that can be filtered out. This is why removing iron and manganese is a real benefit of softening—the process not only lowers hardness but also helps clear these metals from the water.

The other options don’t reliably describe a benefit of softening. Softening reduces scaling potential, not increases it. Conductivity and total dissolved solids aren’t guaranteed to drop with softening because the treatment can change the ionic balance—removing some ions while adding others (for example, exchange processes can introduce sodium), so these measures aren’t consistently improved by softening.