i used just 2 drains for mine. 1 1.5" submerged, and 1 1.5" turned up for emergency. my sump is in the basement and will flow around 9000 gph. i have it dialed down so no water goes in the emerg, and my hammerhead is dialed down a bit. there is no sound, but if i turn off the main drain, the emerg will pick up all the flow.
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