I have a vintage little wonder that was on our boat when purchased in 2000.
we got it up and running in 2005 and it has been great. PPM readings have
been around 400-480 usually. sometimes lower. recently they have been
running arond 700 so I wonder if I got someting in the membrane or its
wearing out. water still tastes great though.
as for output, around 9 oz a minute is an actual timed measurement.
I have heard this unit is discontinued

Rickf
S/V Calaloo