This paper reviews the techniques and equipment used for monitoring water conditions in public, commercial and private pools; it discusses the main disinfection processes of chlorine, bromine, ozone and organic biocide, as well as water balancing chemistry; it also examines reagent and alternative testing systems; considers parameters for total alkalinity, calcium hardness, total dissolved solids, stabilised conditioning, sulphates, chlorides, copper and iron in poolwaters: several Case Studies and Update Appendices are included.

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