I've got an older Octopus NW 200 that i just put back in my sump about a month ago.. It used to work great and pull out a lot of nasty junk.. It literally doesn't skim anything anymore. The neck of the collection cup will have a thick, thick layer of skimmate inside of it, but the collection cup doesn't get one drop. The airline is clear of any obstructions and i have taken the pump apart and made sure it was clean...I have the Outflow pipe as high as it will go just to see if i can get really wet skimmate and still not one drop!.. any ideas? I have already ordered a new skimmer, but i still want to find out if i can salvage this one or just toss it