For Boiler, its depend on ...

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For Boiler, its depend on the manufacturer and phase of the product liquid or solid also the mixtured purity components. Usually for checking for routine test PO4, N2H4,SO3, Polymer or MoO4 etc, and for steam line depend on total alkalinity in the make up water which is defined from calculation of COF its similar for Open Cooling Water for non oxidizing biocide should be dosed by slug