Chalk this up as one more reason to go with a Tunze system for current rather then a closed loop. I've never heard complaints about the sound of Tunze streams, and you'd be less likely to consider moving your sump to the basement if not for the noise of the CL. It's easy to find very quiet return pumps since the flow is typically much less.
I'm not trying to bash the idea, but I know how often people's hobbies change and it would be a shame to make holes in the floor of a new house and decide to pursue another hobby a year from now.
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