<a href=showthread.php?s=&postid=14253244#post14253244 target=_blank>Originally posted</a> by AcroporAddict
I have 4 6105s in operation and they are all silent. I posted this before, but hold the 6105 and wet side magnet in place in the tank and rotate your outside (dry side) magnet holder 180 degrees. This cured a noise issue with one of them that I had.