I find the noise or sound of a VorTech actually varies from one to another. I always put my ear to the glass when aligning them to ensure I get the quietest result possible, yet one of my pumps is somewhat louder than the other. I've also read that if you don't choose the right spacer setting, this can cause the pump to run louder. In any case, I don't find the sound that obtrusive and the features outweigh the whirring or humming noise in my case. There are folks that run very silent tanks and the VorTech will not be for them. I take advantage of the night mode not only to reduce the sound in the evening, but more so to save power & wear & tear on the pumps.
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