Sooooo...I obtained all new filters, DI resin, and a new membrane. Here's the results:
Tap water: 684
RO/DI water: 024
That 24 is coming from the fact that we have carbon/sediment filters that have a slightly too high micron rating since we got them free with the RO/DI unit. Regardless, considering that I don't have ANY nuisance algae problems, I'm really lucky. I can't wait to see what this better water quality will do for my tank!
Special thanks goes to Joel at Aquariums Etc. for letting me pick his brain and for the TDS meter, Scott for picking his brain and the DI resin, and to Buckeye Field Supply for the membrane at the Frag Swap.
So...
Yaaaaaaaay!
Now to sit and wait. I kinda miss not having a 1-1 ratio of "clean" water to waste water.