Performances of two devices for point‐of‐use treatment are reported. One device was a combination of a granular activated carbon bed and a precoat filter; the other was a combination of a reverse osmosis unit, a prefilter, and two granular carbon adsorption units. These devices were studied in order to determine the extent to which they were able to remove various organic, inorganic, microbiologic, and particulate contaminants from potable water.

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Results of this study indicate that the aggregation of clay particles can occur either by coagulation, or by flocculation, or by both, depending upon various factors. Two systems consisting of two different clay minerals and aluminum sulfate have been used to demonstrate the effect of the combined phenomena on cake‐forming filtration.

Experiments conducted with commercial point-of-use precoat carbon filters showed that these filters can significantly and consistently reduce the heterotrophic plate count (HPC), coliforms, enteric viruses, and protozoan cysts in water. Although the effect of silver in the precoat filters on HPC organisms was inconclusive, the presence of silver dramatically reduced coliform levels. The antimicrobial effect of copper in these filters was similar to, but much less than, that of silver. 0.25 + 50 percent (10 k 50 percent) 0.25 + 50 percent (10 f 50 percent)

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