Berlin Turbo setup

[Geofrog]

I have a Berlin turbo skimmer and I am wondering how to properly set it up. I have it running now and I don't get alot of skimmate as the collection cup has a drain near the bottom. I have tried attaching a 2l bottle to collect what comes out of the drain but it always fills up within minutes. If anyone else is running a Berlin Turbo could you please give advise.