The filters we are talking about aren't on all the time and have to be activated via a button on the climate control panel. On the 210s, the button looks like a rudimentary drawing of the osmosis process, with arrows going from a light marking to a dark one. Your owners manual would definitely tell you if you had this option. Or maybe someone here could elaborate--did they ever include a filter which was activated all of the time, without a 'starter' button??

I doubt you have the option if you don't have the aforementioned button.