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Jar testing is a method of simulating a full-scale water treatment process, providing sys-tem operators a reasonable idea of the way atreatment chemical will behave and operatewith a particular type of raw water.
Definition of jar. 1  1a : a state or manifestation of discord or conflictb : a harsh grating sound. 2  2a : a sudden or unexpected shake jars and joltsb : an unsettling shock gave her nerves a jarc : an unpleasant break or conflict in rhythm, flow, or transition works persistently, swiftly, without jar â Sinclair Lewis.