Not too loud. I currently have the pump running some sponge filters in my bedroom tanks. My wife and I haven't had any difficulties sleeping.
Solid Construction:
I took my pump apart and had a look at what was inside. The design is simple and made with solid components that are built to last. The casing is of durable and thick plastic. The diaphragm will unavoidably wear out but instead of throwing away the whole pump like you would with cheaper units you can buy a replacement diaphragm (that includes 1 or 2 air filters). I've had my pump for about two years and am confident that it will last many many more years to come (provided that I replace the diaphragm and air filter as needed).
Adjustable rheostat:
The rheostat adjusts the output of air by controlling the amount of electricity that powers the pump as opposed to using an inline valve on the air hose. The use of a rheostat conserves electrictiy and avoids putting unnecessary strain on the diaphragm and the premature failure that would result.
Versatility:
With 7.0 PSI I've been able to make a variety of different set ups that otherwise would have required at least 3 lesser pumps. Having one pump instead of several reduces a clutter of hoses.
Overall I'm very happy with this pump. I wish it wasn't so expensive. But then again, when you look at the long term, it's not too expensive.This was so noisy, that after making a video of it compared to the Tetra Wisper 60, and the Rena 400, I returned it. It also didn't move as much air as the other two pumps. Which pump (much to my surprise) was the quietest? The inexpensive Tetra Whisper 60.
I have a 70 gallon tank with a 43" Marine Land bubble stick burried at the very buttom under about 1-1/2" of gravel/rock.
You can watch all 3 of my noise comparison videos on youtube. They are listed by the name of the pump, or just look up my user name.
Buy Coralife (Energy Savers) ACL01655 Luft Pump Now
its quiet but it doesnt put out crap for air etter off going to wallmart and buying two dollar oneRead Best Reviews of Coralife (Energy Savers) ACL01655 Luft Pump Here
Had my first one of these for about 14 years! When it FINALLY quit, I bought the exact same one again. Thanks Coralife I've had many air pumps from whisper to tetra to well to make it short I'll never buy another, these have apparently been around for 30+ years and keep on pumping. This is the only pump I have ever had that does not restrict the air flow to decrease the amount of air output but instead has an electric regulator that makes this as quiet as you could possibly want at the sacrifice of some bubbles or tons of bubbles at the sacrifice of some hum.

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