i have a grey skimmer that has a red ring where you screw on the cup.... there is a little nipple that points down where the skimmed material sits.... is it supposed to drain back into the sump compartment or is it supposed to drain at all? i bought it at a garage sale and am wondering if i may be missing something? it produces skimate and falls into the cup...but it drips back onto the outside of the skimmer back into the skim area on my sump...... HELP!!!