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Australian company Ioteq says the iodine in its Isan system will kill bacteria better than chlorine or ozone will--and it won't cost more.
Fruits and vegetables get stressed by too much sun, too--but spraying a calcium carbonate powder on them can help.
You can live without electricity, but not water or food. A crop of new companies are trying to take the chemistry out of agriculture and eliminate crop pests and microbes the natural way.