The amount produced by the RO/DI also depends on water temperature... the cooler the water the less it produces.
Our tap water is about 60 degrees in the wintertime, so production goes down accordingly.
Luckily we're on city water, so I don't have much sediment to filter out, mostly nitrates and phosphates (which help prevent corrosion in pipes).
I really need to get a TDS meter though... that would probably help rather than all this guesstimation I'm doing.
