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Swimming safely in the Chicago River is now one giant step closer to reality, according to sanitary officials. Chicago Tonight details the new disinfection process making that possible.

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Jay Shefsky visits the Thornton Quarry and goes to the bottom of Deep Tunnel to see where the water will flow into the new reservoir later this year.    

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The Metropolitan Water Reclamation District of Greater Chicago is taking the residue of human waste from their water filtration process and transforming into a powerful soil additive/fertilizer that is used in parks, golf courses, and farms throughout the area.