BAC PCE Operating And Maintenance Instructions Manual page 14

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Full stainless steel units and units protected by the Baltibond hybrid coating do not require passivation.
An exception to this are units with a galvanized steel coil bundle which do still require the proper
passivation procedure as described here in this section.
In case you can't keep the pH below 8.2, a secondary approach is to conduct a chemical passivation using
inorganic phosphate or film-forming passivation agents. Consult your water treatment specialist for specific
recommendation.
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