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its more of a question out of curiosity then a solution that i am asking for. i had seen a picture of a sump somewhere (don't quite remember where) where i saw a HOB filter hanging on it and i was just wondering if anyone else was doing it.
I use one on occasion to polish the water. When I use carbon, I just put it on the drain line. My sump is in a separate room so noise is not a real concern. You could fix this by extending the outlet on the filter to reach the water level.