I don't get it, I cannot get a bubble column in my skimmer to save my life. I thought the pump was going bad or weak. So I just put the new pump in and same thing. I cleaned it a month ago and everything was fine. In my new system it just seems weak. I've raise it, lowered it and nothing. It's a vertex in-250 that's 1.5 yrs old. What's wrong with it lol.