what was the size of the top of the sock, mine is about 4" in dia and 11" deep, you may have the bigger one, from looking at the side of my sump, the sock has it"s own chamber to go in. the 2-1" lines run down to the top of the sump and go right to the top of the sock, filter through into the skimmer area and back to the return pump, this way the water is filtered through the sock before it reaches the skimmer , do you have a pic of ur sump?.... here is 1 of mine