Without seeing your sump in person it may be hard to speculate on causes.
However, one thing that makes a huge difference, from a sound perspective, is how the water enters the sump.
I've found that submerging the outputs (any pipe where water enters the sump) makes a very large difference.
There shouldn't be a difference between a Stockman and a Durso ... only the amount of space they take up is different. Sounds like there's some fine tuning needed. The amount of air entering the standpipe will make a difference with the slurping.
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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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