Water Filtration

This book is about the application of science to one area of public decision making, the determination of water quality. It is a universal concern, though one which has until recently seemed unproblematic to most of us in the industrialized west. The quality of our water was one of those things we had forgotten how to worry about; we could rely, we felt, on the authority of our authorities: on the bacteriologists and engineers with their cultures and chlorine, on the managers and lawyers who would ensure that enough good water continued to reach us. Many things now threaten that trust: a new generation of toxic wastes, growing demand for water in arid regions, the prospect of changing climate and, in the United Kingdom, the sale of water supplies to private investors. All these matters have become public issues and no longer do we assume that good and safe water will always come from the tap.

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