Originally Posted by degbowl
I only have one problem. It has always been noisy, but it seems to be getting louder and louder.
The air intake tube that goes into the pump needs cleaning. As the lower part of the intake gets norrower and narrower from salt/CaCO3 build up, the noisier it will get. Mine needs cleaning about every 6-8 weeks. It's almost like the scaling/hard water deposits you see on kitchen appliances and such.
Take apart the skimmer and soak the end that goes in the pump with a 1:1 water vinegar solution for a few hours. You will need a small bore metal pole to scrape the inside of the hard area of the pipe once it's soaked for a bit. I found the thin wire they use to keep flower stems rigid works very well and is cheap. Be very very careful you do not scrape the soft tube further up. If you damage it, the skimmer will not work properly. You'll see what I mean once you get there. The hole in the tube will be less than a mm when it should be about 2-3 mm.