This skimmer is bad ***** pulls a ton of gunk it needs the pumps replaced. If I was to do it I would replace the pumps with a single 5500 bubbleblaster. This skimmer is rated for 400~1200 gallons. It worked great on my 180 then it ran well on my complete system I just upgraded. I paid $1200. For it 1.5 years ago ill take $250 for it. So for $500 you would have a unreal skimmer