hygger Small Quietest Aquarium Air Pump, Adjustable Oxygen Pump 2 Air Outlets Ultra Silent Powerful Aerator Pump 160GPH 5W

These people just might be right when they say quietest. I've had mine running five airstones in three tanks for several months now. I've learned that even the tiny bubbles from airstones do make a sound when they hit the surface. I've just never been able to hear them over my pump before. Now, I'd have to go turn the knob on the pump to maximum for a moment just to hear my pump. Pretty sure I could add three more air stones before I'd have to keep it cranked up enough to maybe hear it when I open a door on the stand, if the room is quiet. So yeah, if you want something that has the balls without the noise, this is a good pump.

Very quiet on all the way! Great product

Great experience. Will come back.

Very good aquarium air pump for the price, good power.

Very quiet, moderately powerful air pump. Actual flow was 720 L/hr with no airstone 30cm deep and falls to 540 L/hr max with the airstone. I couldn't get any more than 7.0 watts of draw. The flow vs power is pretty linear which is good for efficiency. It is big and ugly in my opinion but it's going to sit in a cabinet and has a flat top which is helpful if you are limited on space and need to stack something on top.

A bit larger than most but not impossible to deal with. As everybody says it's quiet as hell though. I only want one air line so I put a valve on one end and plugged it and started running it to test the volume and it was loud as hell. I was unsure what people were talking about. I forgot to place the 2nd airline so I connected that and I actually had to feel the motor to make sure it was working it's so quiet. Definitely worth purchasing.

Update 2: I pulled it a part for a third time. I bought a screw extractor set and I was able to get the stripped screw removed and the diaphragm replaced. I put it all back together and now it is running beautifully and silent. If it had ran this way from the unbox this would be an easy 5 star review. I am $65.00 in on this pump now and it is finally working well after much headache and extra money spent.Update: I received replacement diaphragms that I had to buy, I was able to get one replaced but the screw on the second one almost instantly stripped. I now have a horribly unbalanced single channel air pump that sounds like shaking marbles inside of a cup when it runs at full power. Cool. Still disappointed.I unboxed this after receiving it to get the cardboard recycled asap. I didn't get it installed until a week later. I immediately noticed that one of the ports had 0 air flow and the second was incredibly poor. Unfortunately without the box I doubt I could return it. I took it apart and noticed that both diaphragms were split open. I'm having to buy replacement parts before it's even seen any use. BEWARE that this could happen to you. Keep your box! I have a cheap tetra dual port pump from Walmart that's been running non stop since 2018 and still has amazing output. This has me regretting not getting another one of those. My hygger is now in pieces until I can get replacement parts.

Absolutely perfect little guy. In the lower range it is barely audible (this is what I use alongside a sponge filter for a 10gal betta tank, as they live in relatively still water). At the mid/high range, it can produce a lot of oxygen.I currently have one air tube connected to the Hygger dual sponge filter, and the other to an air stone in a glass on the same shelf (for a quick way to see whether there is air being pumped or not, when looking from across the house or in the night. I did this, for a visual reference, in case the pump ever up and dies on me when out of hearing range (which is not far with this quiet little guy)