All of the following are major steps in treating freshwater to make it potable EXCEPT ________.
A) Reservoirs are used as large holding areas that allow particulates to settle to the bottom
B) Water is treated with magnesium sulfate to reduce the growth of photosynthetic microbes
C) Water is eventually pumped into special tanks that filter it with rocks or sand to remove the majority of microorganisms
D) The final step pumps water into holding tanks for disinfecting chlorination or light treatments
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