On July 24, 2010:
I've had the older whisper pumps last for years. Bought the new style and both diaphragms split within 6 months. Bought another one and the same thing happened. They changed the shape of the diaphragms, which used to have a bit of a bubble shape to them. I have the still working haves of two old whisper pumps that are well over 20 years old running my filters temporarily. I would never buy another Tetra pump.

On July 15, 2010:
This air pump works really great. Quiet and easy to use.

On July 11, 2010:
Well i do have to say that one of my 100s one diaphragm tore and so it stopped working, I was able to repair it myself, but looked for the kits 11bucks so I will have to decide to buy and repair or get a whole new pump for a little more. Oh well, i knew this would happen, but they are still the best deal online!

On May 25, 2010:
OK I have always used whisper filters pumps you name it, its a quality brand and these air pumps are no different. I own 3 of them and they all work great. I have three right now 2 100s and 1 60gl for my DWC. But, I did notice very little difference in the 100gl and 60gl pumps, I believe the 100s have better pressure for deeper water but as for bubbles they seem about the same. Also I noticed like others, there is a difference in air pressure in the two outlets on all three of my pumps. All have different pressure coming out the two valves, I use 4 way splitters to regulate the them so I can have the same amount bubbles out of the two valves. For the price that Pet Mountain has them you cant pass them up, I have seen them double this price and even triple priced in local shops. At these prices I'm going to start selling my old ones off, for about the same price and buy new ones every chance I get. Repair kits can run you up to $15, they need to sell the kits much cheaper its not worth fixing it, if I can replace it for $2 more bucks than the kit costs. Ive had fish and pumps for over 30years, I know there is not a better deal out today for quality air pumps like Pet Mountain has with these whisper pumps.

On April 28, 2010:
I got the biggest Whisper pump they made. It puts out PLENTY of air for my 100 gallon tank. It is sitting on the floor inside the tank's stand and cannot be heard at all.

On April 23, 2010:
We had a couple of these for my son's tank. One was smaller with a single outlet and one a double outlet. They run the under gravel filters, sponge filters, and air accessories without any problem. I didn't realize how quiet they were until I got another (good brand) small air pump to hatch brine shrimp. I was amazed at how much louder the other one was. I had to wrap it in a towel! I'm buying another pump for a new tank and it's a Whisper. Their price is reasonable and they work just fine.

On April 22, 2010:
Had a problem with my small 2 gallon tank being cloudy. The Whisper filter cleared it up fast. I need a second Whisper and can not find it anywhere locally. Guess I'll be back!

On March 24, 2010:
It is powerful, works silently and has a great design.

On March 20, 2010:
MY PUMP WORK FOR 13 MOS THEN QUIT NO AIR,THE DIAPHRAGMS WERE BAD. THE GREAT STAFF AT TETRA SENT ME A NEW SET OF REDESIGNED DIAPHRAGM KIT,AT NO CHARGE WOW! JUST CALL THE TETRA TEAM

On March 14, 2010:
I purchased the 100 gallon pump and it works great. I have purchased others and this one is by far the best. My tank has plenty of bubbles. Thanks

On March 7, 2010:
In my setup this device pumps air to Lee's 2 gallon Under gravel Filter in a 1 gallon tube vase. To my use it supplies more air than the filter needs so I had to limit air flow via a valve. If I had another or two identical setup this would probably be sufficient enough for all. The pump is very quiet, but I would suggest to hide it behind some books for those whom have sensitive ears to a constant humming. In my case I hear the bubbles coming of the filter more than the air pump.

On March 4, 2010:
I have several Tetra Whisper Air Pumps that have lasted years. Bought a new 100 8 months ago and both diaphragms split at the same time. I have never had any diaphragms on any brand pump I have owned go out that soon. And you can't just buy the diaphragms any more you have to buy the whole arm. I can understand since the rubber diaphragms have screws where they can be removed and installed without the cost of the whole arm. If These replacement diaphragms go out as fast as the original ones I will never buy Tetra brand again! I have to many tanks to have to replace parts that soon.

On March 4, 2010:
I hoped to avoid psi headache with it but the two outlets aren't equal in pressure.

On February 25, 2010:
A few weeks ago a friend of mine bought this exact air pump for $50 at Petco. Getting it for less than half of the price is wonderful! It is a little too powerful for my tank, as I have a 100 gallon cube, and I don't really need the extra power to pump air through the length of a long tank. I will probably be downgrading to a 60-gallon pump.

On September 22, 2009:
This pump has did an okay job for me until both rubber cups inside tore and the pump no longer provided sufficient air almost killing my five fish. Not the pumps fault i needed to pay more attention. I like the pump enough to replace the rubber cups having no luck finding these parts frustrating for someone like me that likes to fix own stuff. This is the only reason i am rating so low. 

On March 9, 2009:
I'm using the 20 in my 29 gallon tank. Very quiet!

On December 29, 2008:
We have several Whispers both 60 & 100's on different tanks. We have had them long enough that we needed new diaphragms and think it is awesome that you carry parts so my pumps can keep on doing their job without having to buy a whole new pump.

On October 2, 2008:
The pump is silent as it states. It puts out a fair amount of air, the only drawback I see is it only has 1 outlet valve. You get a t-splitter in the box, but an outlet valve at the other end would have been nicer. Only time will tell as to how long it will last.

On April 14, 2008:
I fall asleep faster now that I have a quiet air pump. Its great

On January 14, 2008:
bought the 77855 for my aquarium and had plenty of air power for my 2 large stones.....

On December 5, 2007:
I just ordered this product + several others last week. All have arrived.
Good Price and Good Service.

On November 12, 2007:
I have the 40 in a 33 gallon. It's extremely quiet and reliable so far. It's easy to vary the rate of the bubbles. I'm now buying another for a larger tank.

On October 14, 2007:
I love this air pump. When I was trying to decide what to get for my 10-gallon, I saw this on the shelf and thought it looked cool. When I did more serious shopping for my 30-gallon, I picked this one specifically. It makes no noise, doesn't move, never stops working, and is actually very pretty sitting beside my fish tank. It is absolutely silent and I recommend it to anyone.

On August 26, 2007:
These new whisper pumps sit on four little feet which prevent them from humming and walking their way off your desk. I no longer have to unplug my fish tank in the guest room to my guests can sleep.

On June 23, 2007:
This pump is such a cool shape and it is small enough to fit in a corner! So far, i am very happy with this air pump

On April 13, 2007:
Just look at it. It ain't a vibrating box anymore. I don't need to hide the pump anymore.

On January 19, 2007:
You can't live without this air pump and if you not decided yet get that before will be too late

On January 3, 2007:
Great product works great, most afffordable price around!

On December 26, 2006:
I have never been disappointed by the Whisper Air Pumps! I am orderiing 2 more for my other tanks!

On November 28, 2006:
This pump is so quiet and works so well, that I am ordering one for my other fish tank.

I totally recommend this pump.