quiet one pumps


In Memoriam
Ocean Runner and Eheim are much better choices. I prefer the Ocean Runner as it is half the cost of an Eheim and slightly more energy efficient. I have tried Quiet Ones and had a QO4000 burn up and electrify my tank. My chiller ran non stop for a day before it got my attention. Once I located the problem the temperature went down right away. Needless to say I trashed the pump and replaced it with a OR3500.
The QO also had major restart problems, was not all that quiet and required frequent cleaning due to a build up of calcium on the impeller shaft. I rarely clean my other pumps?


New member

Umm, Velocity pumps are dead silent, but not many use them any more due to heat transfer.

QO won't restart if you've used it for a few months. Terrible pumps.


New member
Well, I've been running a pair of Quiet One 4000's as my return pumps now for close to two years without any problems. They always restart and are quiet. They do get a vinegar bath every 4-6 months and I don't dose anything, as my tank is not a reef tank.