> you cannot remove the poisons in the industrial waste dumped into rivers by boiling or filtering. That's why those methods aren't used. > People are totally

> you cannot remove the poisons in the industrial waste dumped into rivers by boiling or filtering. That's why those methods aren't used. > People are totally helpless now. Depends on the country, some will regulate industry and insist on properly constructed separation ponds and heavy metal bioremediation.