CBS Evening News for Tuesday, Mar 04, 1975
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(Studio) In Philadelphia, Pennsylvania, ecologists questioning effectiveness of water treatment plants.
REPORTER: Walter Cronkite
(Philadelphia, Pennsylvania) Marshland has ability to absorb pollutants from water. [Dr. Ruth PATRICK - believes marshland plants can be used in treating drinking water in small and mid.-sized communities. Explains how plants remove pollutants from water.] West German project uses marsh plants to clean up Rhine River; details given. Polluted water abounds in US; natural water purification may be answer.
REPORTER: Chris Kelley
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