The chloride level is too ...

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The chloride level is too high coming from the boiler feed water against the spec < 6 ppm. Actually chloride spec 6 ppm is referred to which boiler pressure. The source of  boiler water is not explained in the above write up. Before changing to other treatment, you need to find the reason of high chloride in the boiler feed water.  Besides that, the pH that you are operating is too big band and best to control at narrow band i.e. 8.8 to 9.2 as an example.