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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.
The jar test attempts to duplicate in the laboratory what is occurring in the plant in the relation between detention times, mixing conditions, and settling conditions. By watching the jar test floc form and settle, you can get a good idea of what should happen in your plant for the test chemical dose.