Glad that I found this thread. Just bought a Weipro SA-2012 skimmer yesterday. I set the water level to the mark on the casing. I thought ...wow. the skimmer very canggih. water level so low still can skim. hehehe.
After reading this thread, realised my mistake. Have re-set the water level just below the cup. Hopefully it will start skimming soon.

One question, I am usibng a 1100 liter/hr pump ( the pump for my old skimmer Jebo hang-on type), Is this pump output sufficient for this skimmer?

The skimmer packaging says that I need a 400 gallon/hr pump.