Greg's 75g

[Reef Pilot]

Originally Posted by gregzz4

There's the difference
My tapwater TDS is anywhere from 12 down to as low as 7, so my RO does well on it's own
I always run my product water down the drain until the TDS creep goes away, so I am lucky that I don't need the DI

Yes, and because I run my ATO directly from my RODI to my sump, I always want 0 or at most 1 TDS all the time.