That is BS marketing by someone that doesn't know what they are talking about or is outright lying. You use TDS meters to test ROs mostly, not softeners or filters.
Again, thank you very much and I really wish I did my research before hacking into the ceiling. Now I need to have a drywall company come patch my three holes.
I did not take the softener apart, after testing the whole system last night I figured it was working as it should be but something else was the issue.