Silent Air® X Series Aquarium Air Pumps, 2-Outlet, UL Listed

I use this air pump on a 112 gallon tank with Koi and Plecos, it provides enough air for a 5" air disc and a 12" long air-stone and after running for many months non-stop it's still pumping out a great amount of air, I was just expecting it to pump a little more than it does. However, that isn't stopping me from purchasing a second one for one of my other aquariums that has a noisy air pump, and a second for my large aquarium. I would definitely recommend these pumps, you'll barely know it's there. They do work best when placed above water level though so keep that in mind.

UPDATE 08-11-10

I bought two of these pumps and they have been running non-stop for over 2 years without fail. I would buy more of these in a heartbeat.

It works but it isn't silent. The sound it makes is a vibration rumble. It is the quietest air pump I've encountered. If the noise still bothers you run the air hose from a closet. If it still bothers you get some aquarium plants. I've never had a problem with them making too much noise.

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I have had this pump running for about a year and find myself quite satisfied. The pump pumps air through an almost 48inch bubble wall hose and the other hook up currently just off gases as we don't need it at this time. Over all the pump is fairly quiet as long as it is balance properly. If the pump becomes unbalanced or leans against something it becomes quite loud as it vibrates quite a bit.

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I have had this air pump for 6 months and it has been rock solid.

I keep this air pump inside a cabinet, so any noise is minimal. For the price, I found it to be more powerful and quiet than the air pumps I have purchased at my local stores (Tetra Whisper and Rena Air).

Even though it is rated for "aquariums up to 75 gallons," this pump outperformed a Tetra Whisper Air Pump rated for up to 100 gallons (and the Tetra broke after less than a year).

The 6 Watt power supply for this air pump is what you should use to compare it to other brands. The Rena Air 300 only comes with a 4 Watt power supply, even though both it and the Silent-Air® X5 are "rated" for tanks up to 75 gallons. The Tetra Whisper Air Pump for up to 100 gallon tanks only has a 4.8 Watt power supply.

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ALTHOUGH I AM JUST A SMIGGIN DISAPPOINTED OVER THE SOUND, OVERALL IT IS A GREAT AIR PUMP. IT STATES IN THE ABOUT SECTION THAT IT IS QUIET, BUT ITS NOT AS QUIET AS IT COULD BE. THE PREVIOUS AIR PUMP I HAD WAS QUIETER. MY TANK IS IN THE FAMILY ROOM WHERE WE HAVE THE TV LOCATED, AND SOMETIMES THE PUMP OVER RUNS THE TV DEPENDING ON VOLUME, BUT OVER ALL IT ISNT SO ANNOYING WHERE I HAVE HAD TO BUY A NEW ONE. I HAVE NOTICED THOUGH THAT THIS PUMP COMPARED TO MY LAST ONE REALLY ADDS MORE AIR VOLUMN INTO THE TANK (MEANING MORE BUBBLES)