I don't have a
TDS meter. I've just been running on the assumption that my
RO/
DI system was working well because it was still well below it's expected life. I'll pick one up tomorrow and see what it says. I have a flush kit and I think I've taken good care of my
RO membrane.
I have a kent
RO system too (w/ a flush kit), and I was surprised by the
TDS numbers. My
RO membrane is about a year and a half old. It is only taking tap water down to 60 from 280. The instructions say it has a 3-5 year membrane life, but from some others post I've read and my experience, I don't think thats realistic in most cases.