Dear Oswell, For a more ...

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Dear Oswell, For a more detailed answer probably more information is eeded. Microbiology, total counts, specific bacteria? Type of corrosion?  Have you executed a metalurgical investigation of the corrosion? What is the mettalurgy of the system? Typically I would say you have to approach with Mechanical, Operational and Chemical approach. (MOC). At a first glance I see a relatively low pH for a closed system. Why would you need a phosphate/polymer added for scale control when make up is RO? What is the level of MoO4? 

So too many unkowns for now to give a clear indication what is going on. Cheers, Mark