PS-noticed you said sump, and you mentioned the PSK-100H model.
if you have it hanging off the sump, it's going to depend on your flow rate through the sump from your system, otherwise it's just skimming your sump with lots of turnovers within it.
also, fyi, I have mine hanging directly on my tanks (no sumps) and I get about 1-2 cm of collection a day. I have adjusted the skimmer water level (via turning the tapered pipe on the effluent assembly as designed) such that the water level is about 3 cm into the narrow riser tube of the collection cup. Yes, this means I have to unplug my skimmers before removing their cups to dump the collection.
PS-don't forget remove the plug at the end of the overflow tubing coming off the collection cup. I bought one of mine used, from a girl, she commented "that overflow tube isn't very helpful, it only holds about 1 ml" and I didn't have the heart to tell her... as she would no longer have to worry about it anyway after I bought it off her. I direct my overflow tubing back into the tank, contingency only.
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