RO Question...

[Timbits]

I installed my new RO/DI filter about a year ago... still haven't changed the filters on the thing. Just checked my TDS and it's reading at 1. That seems pretty low still... does that mean my filters are still good? I've read that you have to replace filters every 6 months or something but my TDS has been reading 0 for a long time until recently it's reading 1.

Not really sure when i should change the filters. Just wanna make sure the water comming out is still good. Can someone pls help?

Thanks in advance.

Tim