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Presents information on a novel filtering material which consists of a plastic membrane that contains millions of holes per square inch. Manner in which the filtering material was made; Description of the features and the filtering capability of the material; Experiment that demonstrates something of the power and versatility of the filter which involves the analysis of water for pollution by organisms that cause disease.

The article focuses on the new filtration plant built in Chicago, Illinois in 1964. Valued at 108 million U.S. dollars, the water works and its glass and brick look like a modern corporate headquarters. A peninsula was built by contractors involved in the project and clay chunks and large stones were dropped into place to form the coffer dam. Tunnels were also developed to bring lake water to the plant. It took two and a half years to complete concrete settling basins along two sides of the plant. Details about chemical treatment on the plant are given.

The article focuses on a new plan to build a filtration plant on 61 acres of the 475 acres of the navigable waters within the Chicago Harbor. Secretary of the Army Frank C. Pace Junior has recently granted a permit which is expected to produce a big damage to a very large and important area of the country. The proposed rape of the Chicago Harbor is pretended to be done in the name of progress and the public welfare. But the building of the seaway would make it possible for ocean-borne commerce to flow back and forth between Europe and the Middle West. There are number of unexplained and interesting circumstances in connection with this officially-sanctioned raid upon the navigable Chicago Harbor.