Personally, I wouldn't risk it. They should have given you enough extra cartridges to hook up a new one and finish the full run without cutting into your supply. You really can't see the very inside of the filter, so who knows how much blood is really left in there. Why take a chance on returning a blood clot?
..This is a little 800 watt Generator for $129 (at the moment). You don't need it often...but, when you do, this is not that much to spend for insurance. ...