On the same topic, but a different question. When you empty your collection cup do you just empty it out or do you clean it? Is it better to leave the grunge in the neck?
I check mine weekly at a minimum and keep a small drill bit the perfect size to ream the venturi air hole out in my stand. I clean the air hole, blow through the tube, empty and rinse the collection cup and do a quick brush of the skimmer neck at the same time out of habit.
I have had my Lifereef protein skimmer for over 12 years. The venturi has never clogged, due to the design of bringing moisture in from the collection cup to keep the venturi clean.
First skimmer mod for me
Mod the Venturi if it seems clog prone I drill out find a piece of appropriate pipe say 1/4" inside dia glue in place
I also drill out hole in skimmer lid to accept airline so it draws moist air