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I have a new Blueline pump and it is making a lot of noise. It is hard to tell whether it is from the pump or the PVC leading to the pump. It might be cavitation, but how to tell??

April 26, 2017blueline hard Leading noise pump PVC

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I have a new Blueline pump and it is making a lot of noise. It is hard to tell whether it is from the pump or the PVC leading to the pump. It might be cavitation, but how to tell??

1 Answer

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I have a 2″ drain that is eventually cut down to a 1 ½” ball valve and then the 1″ input for the pump. <... there should not be such a restriction/ball-valve in front of the pump... this, like most centrifugal pumps made for aquarium applications is for "pushing" not pulling... in other words, you may well have a cavitation issue> One interesting thing (at least to me) is that when I pour my water change or top off water near the input to the pump, the bubbles make the pump almost silent. I don’t know if that means anything but thought I would mention it.