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It should be sitting in the sump water some. There are hooks on the back for the unit to hang into the sump from. If a description of it doesn't help, I know I saw some reviews of this unit when it came out that showed how it was to be properly utilized.
I set it up so it's just above my sump water, when the chamber fills up it flows out to the sump water. I have tried both ways., and this way seems best for me..