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I would have thought that the tankers should already be stainless steel or be protected from normal corrosion is some way.

Chlorine gas and chlorides are corrosive but I wouldn't expect the normal concentration of chlorine to disinfect water would cause a major problem - after all galvanised pipes are used to distribute drinking water that has been chlorinated and food grade tanks are used for chlorinated water. However it would be good to check the level of free chlorine levels likely to be used and the pH of the water.

These publications may be of interest: https://mtac.isws.illinois.edu/mtacdocs/CorrosionFinRpt/CorrosnFnlRpt00.pdf although it isn't a straightforward read!

If there is a risk then cathodic protection may be an option but I don't know enough about it to be sure: see https://anodesystems.com/Cathodic_Protection/Water_Storage_Tank_Cathodic_Protection.html

Brian Skinner