Wow, too bad I joined this one so late! Got my filter from the Pure Water Club on Tuesday also so I guess we're water buddies. I'm a plumbing moron but finally I got mine up and running. Didn't find a flush valve on my unit so I ran mine into the sink too. After 2 hours my TDS reading was 6ppm. I just ran it another hour or so and it's at 1-2 ppm. The water I've been getting from my LFS and using for the past year is 6ppm so I'm happy with the 1-2ppm.
Good luck with your unit.
C