Only if he has it. Orange knob is new. not sure when Jeff started using it but my skimmer is only 2 years old and i don't have it. Good chance his doesn't being used it's probably olderTry removing the orange knob it is an access port
I i wll try cleaning the venturi. Any tips or tricks for this?
This is correct and I never said the skimmer cannot handle higher water heights.
What I said was that for people who turn off their return line, or have a dc pump and decrease return flow during feeding (this is done to avoid adding wasteful nutrients to the tank by avoiding food going into your overflow and into your sump) that you need to keep the MAX water level when pumps are off or turned down below the PVC tube, otherwise you will increase the water height in the skimmer and skim wet/overflow.
Now if a DC pump is used for the skimmer as well then it doesn't matter if they have a controller that can adjust the dimming% to the pump during feeding mode and dial down the % to avoid overflow/wet skimming.
You could but I don't.Could you just turn off the skimmer pump when you turn off the return pump?
It's a used skimmer, who knows how the previous owner maintained it. I would visually inspect and then clean everything if needed.Before you take anything apart, try what I said. Take the opposite end of the tube that is attached to the venturi and put it on a glass of water while it is running. Let it suck in water. This maybe clear anything that could be stuck in there.
So I did the RO water thing. Nasty black crap started spinning in the skimmer body. The noise completely goes away when in water or the air intake is completely blocked. Will disassemble and try to completely clean.