coagulation can remove color ...

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coagulation can remove color and suspended solids, but I'm not certain it can reliably purify water to safe drinking water quality for pathogens or contaminants other than hydrophobic ones. Additionally, the flocculant will still be present at the bottom of the water body treated. So any contaminants or pathogens will not really be removed from the system, just moved to another place in the system with the ability to be remobilized. Murky water is still useful for irrigation, and other safer techniques exists for rendering water potable.