Really, what you paid, what you get. I have been using it for about two months on my 75G plus 10G sump. It produced 1/4 inch of skimmate on the first two weeks. Since then, it does not collect any. I can see the bubbles but just does not push high enough to the cup. I followed the instruction and setup the correct water-level. Ended up I added a bag of chemi-pure to the sump. Also, the plastic is cheap, body is bulky, require higher GPH
powerhead which adds noise and heat to the tank. I will go for the AquaC when $$$ is ready.