i notice that if the air valve is at 2:00, the cup must be very high, but that sounds like there were some other issues, perhaps something with the NW who knows?. i am running it wide open and that seems to be how most do.
here is a picture of tonights cup after ~28hrs of skimming. just cleaned it out and it was very very gross. the odor in the house was bad. i set the skimming much drier this time to see how it does. with daily cup fulls the salinity can really change with only 20g of water.