The following reference ...

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The following reference provides corrosion rates based on free chlorine residuals.  Note that this is for the bulk concentration of chlorine.  I would suspect that the local concentrations underneath a chlorine tablet would be considerably higher than the bulk chlorine concentration in the tank.  https://nickelinstitute.org/media/1673/effectofchlorineoncommonmaterialsinfreshwater_14049_.pdf

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