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By: BillT

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Pumps should operate quietly and unless designed to not spew out bubbles.

Problems with bubbles (besides esthetics):

Air is getting to your pump impeller from somewhere. Except in a protein skimmer (foam fractionator) this is not normal and can lead to problems. The impeller (spinning thing that moves the water) housing has relatively high pressures combined with high turbulence. This can cause the water to be supersaturated with gasses from the air when the water is returned to the less extreme tank environment. It may not be a problem for you if the pump problem is intermittent. Tank aeration can help reduce supersaturation in the tank.

Here is  a link to a discussion of gas bubble disease:

http://zebrafish.org/zirc/health/diseaseManual.php#Gas%20Bubble%20Disease

 

Source of bubbles: Unless your pump is designed to make bubbles for a protein skimmer, something is probably wrong with you pump or plumbing. Generally, this would be a leak in the impeller housing (craked or not on correctly), its seal (problem with O-ring?), in the plumbing upstream of the pump (on the suction side, could be cracked or have bad joints), or the water intake from the tank (or sump) to the pump is sucking in air. Leaks where the water is being sucked to the pump will tend to leak air into the water stream rather than letter water out. If air is being sucked into the water intake, it could be moved deeper or the inflow could be diffused by using the equvalent of an underwater spraybar, a tube with many holes so the flow through any single hole is too slow to suck in air.

 

Pump sounds:

Your sound probably is due to the air getting in, but it could also be due to bearings (usually a squeal sound) or the impeller not always being properly aligned and hitting the impeller housing (rapid series of impacts). All these things should be fixed.


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