My plumbing is hooked up so that I can run part main drain and part skimmer, or 100% of either one. In order for my Creepy to operate properly, I have to shut the main drain completely and run all suction from the skimmer. When I do this, my pressure @ the filter drops about 5psi (compared to when I'm running 50/50 skimmer/main drain) and I get some air bubbles from returns. I also notice that my pump basket doesn't fill right up so there's lots of splashing going on in there. Now if I run 100% skimmer without the Creepy hooked up, I get a similar situation, but to a lesser extent ... about 3psi loss, less bubbles, and less splashing in pump basket. Is this "normal"? Do I need to look into anything? And yes, I'm running the Creepy with the proper suction valve, etc, etc, etc. I can take pictures of my plumbing if necessary.