<a href=showthread.php?s=&postid=9695480#post9695480 target=_blank>Originally posted</a> by CaptainCoral
Matt Rise.....Is the skimmer exit gate above the water level in your sump? I would like to hear more about the gate valve issue. It will raise the water line the more it is closed until ultimately it floods as the water coming out has no where else to go. I suspect you mean it won't lower enough. If so, I recommend to take the exit gate off completely, and maybe even the threaded nipple as well. This will allow more water to pass through your skimmer, and still keep the air choked for minimum bubble size. BTW, the more the air is choked, the higher the water line will rise, and the more pressure you get at the injector. In my experience, the ev180 and likely the ev120 as well (never used one) are more sensitive than my ev400. My ev180 (when stock, and now) needed more water through the box than the 1" exit could handle to run it at peek. So I run it without the exit gate. My next modification to my ev180 will be to remove the 1" exit bulkhead, and Install a 1.5" in it's place.