Biggest step is to stop polluting, but that always isn’t a fix for contaminated water. Bigger things like garbage can be handpicked, but the biggest threat polluted waterways present is the presence of xenobiotics (man made chemicals) and other elements found at toxic levels. So treatment of these waters vary based on the amount of money you can put into the restoration process. Wastewater treatment with chemicals is an option, or we can look into natural methods. One being using organisms that can essentially “filter” out the bad and leave behind the good. Organisms such as seaweed or other phytoplankton (algae in general) are good contenders for wastewater treatment of rivers and other natural bodies of water
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