I have an elderly CPP2+ which I have used for many years to develop film, and which I have been very happy with it, doing B&W as well as E-6 in formats from 35mm to 4x5 in both 1500 seris and 2500 series drums. I recently acquired a 3063 drum to be able to process 16x20 and 20x24 prints - this is the first time that I have used an expert drum with my system. There is a slidy switch on the lift which redirects the flow between the upper and lower ports on the lift. I moved this switch to the upper position, and when pouring the chemical into the drum the first time, it worked fine. When draining the drum, if I lift the lift all the way, the switch seems to move to the lower position by itself, and the drum drains into the water bath rather than through the drain tube. Is this the way things are supposed to work? How do I recover my chemicals for reuse or proper disposal?