tcyiu
07-04-2009, 01:05 PM
My new Eheim pump situated underwater in the sump emits a powerful low pitch, low amplitude hum. The floor near the sump vibrates.
I am experiencing peaks and valleys within my living space. Depending on where you stand within a 15ft radius, the hum varies. In other words, in some places, the hum is louder, but becomes quiet if one moves over by a couple of feet.
To mitigate the hum, I have the pump sitting on a couple of short segments of vinyl hose (acting as "rubber feet").
When I first got the pump, the flow was too great, I restricted the output to 1/2 inch plumbing (should be 5/8), and added a ball valve to cut the flow back a tad. In addition, I modified a prefilter from a power head and put this on the intake of the pump.
I wonder if I had "starved" the pump, causing it to go out of whack. I have since taken the pre-filter off and the hum seems to have diminished a tad.
Any other ideas. I am generally happy with the setup, but I spent the extra bucks on Eheim because I wanted complete quiet which I'm not getting.
Tim
I am experiencing peaks and valleys within my living space. Depending on where you stand within a 15ft radius, the hum varies. In other words, in some places, the hum is louder, but becomes quiet if one moves over by a couple of feet.
To mitigate the hum, I have the pump sitting on a couple of short segments of vinyl hose (acting as "rubber feet").
When I first got the pump, the flow was too great, I restricted the output to 1/2 inch plumbing (should be 5/8), and added a ball valve to cut the flow back a tad. In addition, I modified a prefilter from a power head and put this on the intake of the pump.
I wonder if I had "starved" the pump, causing it to go out of whack. I have since taken the pre-filter off and the hum seems to have diminished a tad.
Any other ideas. I am generally happy with the setup, but I spent the extra bucks on Eheim because I wanted complete quiet which I'm not getting.
Tim