Mine's certainly louder than before when I had a pipe extend all the way into the sock and underwater. I laid a strip of acrylic over the first sock so the water rushes across it and falls over each side as well which made it quieter. Once the first sock is full the setup gets quieter but the old setup was dead silent until it overflowed (then was very loud).
I'm not too concerned about the noise aspect mind you. When I shut the door it all goes away.
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