so i picked up this new sump can't figure out what this compartment is used for? the only holes are those at the very top that you see on the picture and theres a pipe that goes all the way down in a cup im not sure what any of these are for, also theres another compartment behind that one that the only connection to the sump are the little holes at the very top which is also on the picture no other connection to the rest of the sump