Nice product but running water was pretty loud to leave ...
586489
Nice product but running water was pretty loud to leave on all day.  Pets seemed interested in it but it was to loud to leave out.
2575785
Nice spray, but rather loud.  Holder does not grasp shower head tightly, so head tends to turn.  Hose is not covered, will get hot if running hot water.
4882740
I purchased two of these pumps and connected them to a Hydor Smart Wave Circulation Pump Controller. While the pumps are running they are quiet and seem to move lots of water. However, the pumps make a VERY loud *Click* every time the wave-maker turns them on, and can easily be heard from across the room. These pumps are nice, but would recommend against any sort of stop and go application.
3073471
I bought this product because I was in search of a silent filter for my 5.5 galon aquarium that sits on my nightstand next to by bed. After reading the reviews, I decided to give this product a try and the price was resonable. I discovered it was not silent when I put it in my aquarium, however, all I heard was a low hum so I decided this would be sufficient. I pruned one of the live plants in my tank and some of the small leaves were left in the water from this. I noticed they were plastered up against the filter suction and every once in a while I would hear a little extra noise from the filter. Well today I cleaned my tank and decided to take the filter apart and clean out the leaves. I got everything out and put it back together carefully just so. When I plugged it back in it was a little noisy and this noise got louder and louder over the period of a few hours until it was so loud you could hear it throughout my house. I was afraid the fish were going to die because the noise was awful! I'm sure I put it back together right and now am questioning whether the leaves had anything to do with the increasing noise of the filter or if it was slowly breaking over time regardless. Either way this product should be more sturdy.
1016808
This works well for the price but it makes lots of water and many water like noises. This can be annoying, especially when you're trying to sleep. The other issue I have is that the controls are rather confusing. It took me a solid month to work out how to use the timer correctly.

Overall I recommend this product, it cools as well as other big names that cost twice as much.
986318
Alright so this has everything to be a great filter: flow adjuster, bio media, filter sponge, charcoal, and to top it off it's a great price. The only problem is that it's loud as heck! I had to return it because I keep my aquarium in my room and there is no way I could sleep with the noise. Actually the noise bothered me even when I was awake in the room. It sounds like a knocking noise coming from the motor. I disassembled it and cleaned the motor and impeller but to not avail. So I ended up returning it. I guess I'm gonna stick with my Tetra Whisper filter. Although the Tetra also has its downfalls, it's at least as quiet as its name suggests. I give the aquaclear 3 stars because it has all the right stuff but not the right noise level. There's also the possibility that I got a faulty product (even though I have read countless forum entries about the same problem). Anyway, keep this in mind when you consider purchasing!
1281465
I really like this product. Only reason not 5 stars is it is hard to clean. Some comments say it is loud - you can hear it wrung in when it is low on water but it is certainly not what I could consider loud. The increased volume when the water is low is kinda nice cause I then know I have to add water to it.
2877945
The Drinkwell is really noisy.  I returned this product for the Petmate Deluxe waterer, which is very quiet, and has an on/off switch.
217076
As others have stated, this filter is LOUD.  It produces a gurgling spashing sound in the back of the filter where the water enters and then creates additional noise as the waterfall splashes over the blue "comb" and back into the tank.  The return is just slightly too short for my 65 gallon tank which is filled almost to the brim, even though the filter is firmly in place and seated properly.  This means that there is about a centimeter of space between where the plastic on the waterfall ends and the top of the water.  Lots of noise from the water pouring back into the tank.

As if this wasn't enough, I've had to take the filter apart no less than 5 times to clean out small gravel and sand that keeps jamming it.  Since there is no flow control the filter runs full blast.  I have the suction pipe on it's shortest setting and there is more than 6 inches of clearance to the bottom of the tank, but the suction is strong enough to still pull up sand off the bottom apparently.

I'm tired of finagling with it.  As a solution to some of these problems I've stuffed the intake tube full of loose filter floss.  It's probably a bad idea because when the floss gets clogged it's going to get sucked up inside the filter.  So I have to change it often.  One day though, I'll forget and burn out this filter.  When I do, I'm not going to get a whole different brand all together.
4359357
This is an attractive waterfall faucet with a brushed nickel finish. The handle functions smoothly and the water flows out nicely, but the flow is louder than other waterfall faucets I've seen.
3794629
This is a great product and is made of solid construction.  It's also easy to operate with the large finger turn-off.  But if you're using it as a throttle to slow down the water flow, then it can be a little loud.  Maybe it's just loud in my shower as the noise echos off the tile, but I just thought it would be good to let others be aware before purchasing.
4396285
It's pretty. It's kinda loud though, not the pump or anything as that is quiet as a mouse but when the water flows into the bottom of it. I am happy with it and am getting used to the sounds of flowing water in my dining room.
860143
The water pressure is fine. My only complaint is that it is LOUD!!!  Definitely louder than my old shower head.  Has this high pitch sound to it.  It is a nice looking shower head and has great swivel.  It's just loud.
3114924
This pump moves a lot of water and is not audible from more than a foot away. The speed adjustment is very annoying to get to but since it's quiet I just leave it on the max setting all the time.
1517126
The interior finish is well constructed and easy to keep clean. The issue I have is the sound when it runs. It's loud and annoying...
3247048
I bought this fountain because I have 2 cats and 1 dog. The cats love running water, but the dog is very tiny and I wanted a fountain that wasn't too high so that he could drink from it too. That part worked fine. He had no troubles reaching the water at the bottom. When I read the reviews, many of them said that this fountain was quiet and I believe they were referring to the motor because the water feature was very loud. My husband put this together while I was away, and as soon as I walked in the front door I heard this fountain from our back room. It also splashed quite a bit and we only had the one spout on. This fountain works, but if you are looking for a quiet, relaxing water feature for your pets to drink from, then this is not the fountain for you. I am currently returning this fountain because I found another one from a different company that is much quieter and suits our needs better.
1819771
It seems like a nice product. The install was not too complicated to install given the instructions were clear. The water tastes good and seems good quality no leaks under the sink. What I don't like is that when the tank is filling sometimes the lines shutter and vibrate. Another problem is the flow restrictor seems to allow a constant  trickle to the drain.