@LL Many thanks for your comments - much appreciated. I will study what you suggest.
I am not convinced about the 'learn to live with it' philosophy. I tried that for the first 18 months, with minimal success. Maybe my system is just too old to adapt.
Yes, a lab test would be great - if you have any suggestions as to how/where to organise it and what exactly to ask for.
Thanks again for your detailed comments.
Depending on residential communities, some would unfortunately skimp on periodic water disinfection.
Property management, which you pay an annual fee to, may post advance bulletin notices to prepare residents of the scheduled shut down of central tw in the compound for disinfection, usually lasting a few hours.
If it helps alleviate your concerns @bub, even just a tad, perhaps reach out to your pm to check if they are on on top it.