I second Ross's comments ... flex line for the drainage is not necessarily optimal. I tried that too with my first sump. If it had a low spot, then what would happen is it would slow the flow ever so slightly, then the pressure would build up and release and the flow would speed up again. It sounded like a toilet being flushed, every 30 seconds to 2 minutes. It was horrible.
The best results I've ever had with reducing noise, involved having the water "slide" into the sump at a 45 degree angle. I've tried every combination of 90 degree bend, above and below waterline, etc. etc. etc. and while some of that does work to reduce noise, for me I found the best results with a 45 degree angle. Not always easy or practical though, but something to ponder perhaps...
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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