While most growers want a noise-free indoor growing experience, the bitter truth is that there is no such thing as a noise-free indoor growing experience. Growers who have been growing weed for some time now will know that there is always some or the other sound that keeps playing around in the background. Air Pump is one of these unavoidable sounds that WILL be there and there’s practically nothing that you can do. At best, you need to look for a pump which has the least decibel levels. Anything lesser than 45 decibels should get the job done for you. To sum it up, get ready for some noise - but depending on the pump you choose, the noise might be lesser than other pumps.