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Clearing the sewer line to the real estate editor:

Every six months we use a compound made by the Hercules Chemical Company inc. to keep the sewer line clear of roots.IT is called R-D (root destroyer). The company is at 84 Fifth Avenue, New York, NY 10011.

Active ingredients are copper sulfate and pentahydrate.

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It has been completely effective for several years in keeping our sewer line clear. Frances P. Matthews Sun City, Ariz.