What is sodis method of water purification ​

Solar water disinfection, in short SODIS, is a type of portable water purification that uses solar energy to make biologically-contaminated water safe to drink. Water contaminated with non-biological agents such as toxic chemicals or heavy metals require additional steps to make the water safe to drink.

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answer; exaggerate what you believe is the deception and state it, hoping that the other will jump in to "correct" the statement;