Trickling filters

Date: Feb. 21 1962 | Identifier: 0741-b27-fb-v27.b.48
Sewage water being distributed by a rotating arm over a trickling filter of gravel which absorbs the waste in the water. Date from negative sleeve. more...

This project was partially supported with federal LSTA funds made possible through a grant from the Institute of Museum and Library Services, administered by the State Library of North Carolina, a division of the Department of Cultural Resources.

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