I've got a brand new Mag 12 powering my closed loop. I can hear what sounds like air swishing around inside the pump, however my tank is free of microbubbles. The noise is just loud enough to be annoying. Let me be clear, the noise is not motor vibration or the result of a banged up or misseated impeller. Its sounds like the pump has airbubbles in it.
I applied a layer of silicone to each joint on the intake side of the pump to assure its not sucking air. The noise stops when I limit the output side of the pump, but this of course reduces my flow substantually. I don't see any microbubbles until I limit the input side, which is obviously the result of cativation but does not produce the swishing sound.
I'm at a loss. I would try increasing the diameter of the intake plumbing but this would require tearing down the whole tank and I think what I got should be sufficiant. This is the way I have th intake setup now:
2" strainer to 2" bulkhead to 1" reducer to 1" elbow to 1" True Union ball valve to 3/4" MPT reducer to pump.
Any help would be appreciated,
Thanks, Nick
I applied a layer of silicone to each joint on the intake side of the pump to assure its not sucking air. The noise stops when I limit the output side of the pump, but this of course reduces my flow substantually. I don't see any microbubbles until I limit the input side, which is obviously the result of cativation but does not produce the swishing sound.
I'm at a loss. I would try increasing the diameter of the intake plumbing but this would require tearing down the whole tank and I think what I got should be sufficiant. This is the way I have th intake setup now:
2" strainer to 2" bulkhead to 1" reducer to 1" elbow to 1" True Union ball valve to 3/4" MPT reducer to pump.
Any help would be appreciated,
Thanks, Nick
