I have the same issue. Right now I am living with the sound as it is not that important. However, in my past readings I have heard of people putting a U shaped peice of piping on the end of the outflow. In essense, you are bringing the pipe to the bottom of your sump and then accross the bottom and the up slightly but below the water level. Also, I have heard of people drilling tiny holes along the horizontal peice of pipe that lets out the air bubble slowly as opposed to the big loud bubbles.
Hope this helps. I will be trying this on my new sump when it gets built.
Chris
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