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I've had this for a couple of months now and it's still super quiet.which I need as my tank is in my bedroom. Product is as described. ;-)
If both outlets have hoses on them, whether they are in the water or not, this will be a quiet air pump. With a quiet pump and keeping your air bubbles away from the filter intake, you should have a system quiet enough to sleep next to. Therefore I don't recommend using a full length back bubble wall with a top filter, as the filter will take in the bubbles and cause noise. Having two outputs is great, you could easily feed two 30 gal tanks with this, and it seems like this could handle a 100 gal tank.Also.: Make sure to position your bubbles emitting from your stone/bubblewall NOT near(under) your filter intake. .if you only use one of the two outputs(like I do), put a piece of hose onto the unused outlet - it will muffle the noise it makes[I don't know why they don't tell you this in the pump instructions]. Both Tetra Whisper and Rena brands have superior quiet engineering. The intake will take in the air bubbles and cause significant noise as it spits them out up near the filter[gheez, why don't they tell you this in the pump instructions]. Whatever you do, don't buy Top Fin pumps,.they're cheap and cheaply made - too noisy.
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