Polluted Pond Spurs Clean-Up Innovations

For over a hundred years, raw sewage has flowed into Portsmouth's South Mill Pond after every heavy storm. The city is nearly done with a $30 million waste water system upgrade. That will reduce future pollution, but to deal with the residue from the past, residents are working with everything from mussel beds to tidal cleansing.

Correspondent Roger Wood has part two in a 2-part series.