EheimAdjustable 400 Air Pump

I own the Eheim 100, 200 and 400 air pumps for 4 years now and I love the Eheim brand simply because of the german engineering quality. I own there external filters, air pumps (100,200,400) and multiple other products. There products never fail to impress me. These Eheim air pumps are clearly excellent quality. Very durable and rubberised feel, can be wall mounted, individual and adjustable air outlets, these are very quiet compared to others on the market, i simply always put a piece of under tank foam underneath them just to stop vibration noise on the tank cabinet. Quietest air pumps i've ever bought i would buy again if needed. Eheim are a great quality brand so probably last me years to be fair. These are powerful air pumps not weak like some others.Some people saying they are not quiet, no air pump will be 100% quiet and hence i always put my air pumps underneath some foam (fish tank base foam) for example to reduce vibration noise, if you put an air pump on a hard surface ie, wood, glass then you will get vibration noise. I have mine in my tank cabinet and do not know it's even on it's that quiet. You will hear more noise from the air bubbles in the tank than you would hear the air pump. I honestly cannot hear it at all in a quiet room with tv on on low. Would highly recommend this airpump and the Eheim brand in general. I love german engineering as always get good quality products.TIP: Do not forget to buy decent non return valves to prevent water syphoning down air line tubing into the air pump ie, if electric go's out (this prevents flooding, potential electric shock and fire). A cheap must have item for anyone with a air pump. Safety is a must when dealing with water and electrics.Also don't forget to buy airline tubing, It comes with approx 1 meter (approx just over 3 feet) of air line tubing but may not be enough for everyone. just measure and decide if it will be enough. Comes with a diffusor (two with the 400) to which they are adjustable so you can make bubbles bigger/smaller (i personally don't use these myself), nothing wrong with them however.

Excellent air pump, quieter than expected and powerful enough for reasonably deep air supply. Very easily set up and perfect for my requirements.

The media could not be loaded. So far so good. The Eheim air pump is quite quiet, not super quiet but if you install it inside aquarium cupboard it's almost noiseless. I installed additional air valve for precision air flow regulation. I'm very happy now. Will see after few months.

After much research looking for a truly silent air pump I came across reccomendations for this eheim model.1st things 1st, you won't find a traditional air pump that is truly silent so give up hope of that,That being said this model is very quiet but unfortunately the sound from the actual bubbles are very loud which will be the case no matter what pump you use,Even on the lowest setting the pump is extremely powerful, so much so that I had to separately purchase an adjuster valve to lower it even more,The included adjustable air stone seems OK but I did expect it to be better.Delivery was really quick,Eheim products seem to be well made and sturdy so hopefully this lasts well, I also have an eheim canister filter that has been going strong for 3-4 years so have no doubt of the quality.

Great pump....so quiet compared to others.

Great air pump. I brought extra airline as it only comes with 1M which isn't a lot in my opinion, and anyone who wants to store this below the tank level will need a no-return check valve too so there are no issues with drawing the water out if there's a power failure. Otherwise it comes with everything you need and it works pretty simply, it's mostly silent too. I say mostly because sometimes it will randomly vibrate very loudly in the cabinet i have it in so I've had to place some filter floss underneath it to deaden the sound. Being able to vary the power of it is great, and the stream of bubbles are very nice, my tetras were wary at first but now they dart through or hang out near the stream and seem to like the flow of it on the lowest/gentlest setting the most.Overall, Eheim products are the ones to go with in my opinion, I have a filter of theirs too and the build quality is unbeatble, I trust them far far more than other brands

Pump works brilliantly, using it for sponge filters on sponge tank and it works really well for this.It's a compact unit, so not too large, tucks in well behind tanks.The included air diffusers are excellent, and do a great job of creating a smooth flow of bubbles, even at a max setting they're not crazy loud when they break the surface.The issue I have with it, is the pump itself is quite loud and is giving a noticeable humm so it's not great in my placement in the living room. In a fish room, this wouldn't be an issue.Overall a great pump, just be aware that it's nowhere near silent.

Upgraded the pump that came with my son's 60l Biorb life, which was ridiculously noisy. This Eheim pump was just an absolute game-changer.LOADS of bubbles, even on the lowest setting. Miles more than previously through the bubble tube. Used the second outlet for one of the airstones provided with the Eheim pump. Caused such a great current that I feel confident we can now have bamboo shrimps.Best bit: SO QUIET! The bubbles are noisier than the pump on all settings. Just amazed that we put up with biorb pump for weeks before investing in this. Best upgrade ever.Note: For anyone with a biorb life wondering, you can add an airstone even if your lid already has a heater cable through it by drilling through the tank above the waterline. Use a wood bit, preferably already dulled a bit, use frog tape on each side where you drill, and go super slowly with hardly any pressure. Catch any swarf on the inside by taping a folded piece of thin plastic (e.g. from windows in food boxes) to the inside. Takes ages but works.