GOOD SKIMMER. QUIET AND SILENCE
589235
GOOD SKIMMER .QUIET AND SILENCE .IT GOOD LOOKS ON  AQUARIUM
1201805
Mostly quiet, but burbles occasionally during operation. Cost effective. I bought two of them because of the low price. Been using for over a year without problems,
2379212
I put the Quiet Flow 20 on my 25 gallon aquarium and I am very pleased.  Since the pump is submerged, the only thing I hear is the trickle of the water.  Even with a low water level it is quiet.  This filter is also slimmer than the one that came with my tank so it allows me to push the cabinet closer to the wall.
Just a tip: It does say that it is self-priming (which it is) but I installed this filter when I did a water change and thought I could start it without filling the tank completely, with only the intake in the water.  The water needs to be up to the auto-start pump for it to run.
Very happy with my purchase!
1899510
So far so good. This fountain is whisper quiet! We had to get rid of our old fountain because the pump was noisy.
3760879
I've owned 3 pumps before this one, and they were also advertised as "silent". I'm not sure what their definition of silent is because they were much louder than my 50 Gallon filter! After getting fed up with my last pump I decided to order this Tetra "Whisper Series" to try it out.

This thing is almost completely silent! I cannot hear it over my filter, and the pump itself only emits a very mild hum noise. It has been running for a few weeks and the noise it makes has not increased. The amount of air this outputs is also sufficient enough for 2 air stones, and it comes with an adapter to split the single output into two which I found to be very useful. The construction of the pump is top notch, and the rubber feet stick really well and do no rattle.

Tip: If you wrap the pump in a hand towel (leave an opening for heat dissipation/air flow), it will eliminate most of the mild hum noise. You could even take it one step further by getting a small cardboard box and putting the towel-wrapped pump inside of it, cutting two holes, one on the top for heat dissipation/air flow, and one on the side for the air nozzle output and then stashing it in a out of sight place and it should be COMPLETELY silent.

Good luck!
4507102
so far so good. the monitoring software leaves a little to be desired. but its quieter than my last Corsair. powers everything just fine.

No complaints really. don't pay extra for the monitoring though. its about useless.
2965202
it is quiet but doesn't hardly have any pumping power. I guess if you were looking to aerate a small container of water it might get the job done but definitely not for DWC or anything that requires turbulent water
3918632
Works great and quiet. Can replace 3 times for the cost of a brand name pump at the pool store. Seems to  have the same quality build as well. More than enough power and volume for 18 foot round above ground pool.
3444634
I bought this to replace my aquaclear filter that stopped working. This one seems to have a harder time starting up then the other one I had. The parts are easy to remove for cleaning and it is pretty quiet.
3088187
Bought a 3/4 HP Insinkerator, and the rubber baffle was very good at silencing the disposal, but waste had to be pushed thru it into the disposal, and would not drop into the disposer with water flowing, a minor pain.

This baffle has slots cut in the unit to allow "fingers" of rubber that pass waste items into the disposer with normal water flow...  It is not a quiet as the old baffle (which was nearly silent), but is quiet enough...
3398070
This thing is built really well and is very quiet and it seems to be doing its job but it took several weeks to start skimming like my old coralife 65. I'll post an update in a few more weeks.
2474364
Quiet , though only at low and medium settings. Normal for most all units.

Very good price point

Simple operation

No guessing
... filter alert
2872744
Not silent, but quiet enough to not be distracting. Will probably add some more rocks to the fountain to create more "water noise" because it wouldn't take much to cover the hum of the motor. Works well.

*Edited 7/8/18* ... This pump has run almost continuously since December, and has continued to run dry for over a day twice during that time. Still works great.
767165
Buying my second one. I broke the first one my mistake. But so far this is a great skimmer for the price it goes to work on the first day. Can't wait to try there bio pellet machine. Only problem is finding replacement parts the pump couldn't find one that would work.
2394493
Works great.  The bracket that holds it on the pool isn't very good.  Overall we are very happy with this skimmer.
4353280
This has been working great. Does just was it says. It did take a bit to put together and adjust the setting but this is our first skimmer, we were leaning.
2830619
I just installed this skimmer and I already really like it. It seems sturdy and well built. I've installed this in my shallow reef tank which is only 7 inches high, and it fits with no problems. Ill be moving this into a new sump shortly, but I think I would still be happy with it living in the display tank, as its pretty thin and unobtrusive.

Based on some other reviews I was worried that the magnet would be an issue. I've had no issues with the magnet holding the unit up or coming off. From other videos online, and the pictures in the manual, it looks like they've redesigned the magnet to be a bit more solid.

Im only giving this 4 stars at the moment, since Im getting a fair amount of micro-bubbles. Initially I had setup the foamer with the surface skimmer extension. After seeing the micro bubbles I switched it back to the factory position with the inlet pointed into the removable cover on the bottom. That resulted in most of the bubbles getting trapped and pulled back into the skimmer. Im assuming thats why they deliver it in this configuration. I'm hoping once the unit is broken in, the micro bubbles will cease completely.

As per the noise level, at first I left the black cover off of the silencer, which makes the skimmer very loud. So if you're thinking this thing is obnoxiously loud, look for that little black cover. Im not sure why it comes with it removed. With the black cover on the silencer, along with the top on the collection cup, this thing is super quiet. Its perhaps a touch quieter than my mp10 pump, and is no problem having this in my living room.

Ill be updating this in a couple days once I see how the skimmate looks, and if the micro bubble issue persists.

UPDATE: I'm actually now returning this skimmer, and not as happy with it as at the outset. My primary issues with it were a reduction in skimmate, as well as always having to adjust it up and down.

Tuning this thing requires the water level be at a specific point, which seems fine, since I have a top off that maintains exact water level. However, feeding, amino acids or basically any slight change in the tank causes this skimmer to change its foam production rapidly, potentially overflowing the cup. In addition, dialing up or down the production requires moving the skimmer up and down in the tank, which is a huge pain. The dial that is supposed to provide control for the air flow really doesn't and is basically an all on or all off affair. So basically I ended up moving it up and down every day.

My second major complaint is that after adding a sump with a large volume of new water, the skimming on this completely stopped. There was no foam head for nearly two weeks, and no skim mate production. Contacting their support online, they basically told me that with the large water change there were not enough organics in the water. Prior to that, I had already noticed a decrease in the skim mate production. So basically, this had pulled out all the stuff it could, and got to the point were the water was too clean for it to really function.

I've since ordered a much larger, and actually less expensive skimmer, http://www.amazon.com/SCA-301-Gallon-Protein-Skimmer-Sump/dp/B00CML49CK  , that clearly is able to pull skim mate even with my reduced levels of nutrients. The new skimmer began producing a nice foam head shortly after being added to the tank, whereas this wasn't foaming at all.

So overall I think this would be a nice skimmer for a very small tank without room for anything else. But if you can fit a higher quality skimmer, and are looking for an ultra low nutrient system, look elsewhere.