Abstract
This article summarizes the results of the use of the membrane filter (MF) and MPN procedures in Illinois during the fiscal year 1960‐61 by comparing the costs and production time involved in each procedure. The data was provided by the six laboratories of the department, which are located in different areas of the state. The sources of the samples tested included wells (dug, drilled, and driven), surface supplies, swimming pools, bathing beaches, and stream samples. Experimental apparatus is discussed, along with costs for media, labor and materials.
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