The utilization of granular carbon filtration is a relatively simple and economical procedure. It is possible to adopt existing plant filters for a combination filtration‐adsorption unit process with minimum alteration, by filling them with granular carbon. This article summarizes carbon bed design criteria for the filtration‐adsorption technique as well as for adsorption alone.

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The availability of regenerable granular activated carbon makes it possible to convert this laboratory technique for producing superior quality water into an economic, practical plant‐scale procedure for processing drinking water in public systems. A “regenerable” activated carbon is capable of being reactivated to restore its adsorptive capacity lost during use. Such regenerable activated carbons can be used over and over again.

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This article provides data on the control of red water and disturbances in distribution systems caused by surges and higher‐than‐normal velocities. From results obtained, it appears that red water from corrosion of unlined or unprotected cast‐iron mains should not result in extensive consumer complaints, if the CaC03 saturation index is maintained within 1.0 unit of saturation (a saturation index up to ‐1.0).