The black visible pump is for your in-pool cleaning system; I'm guessing your actual pool pump is on the other side of the filter. You'll need to take some more pictures. If you would, mail the pictures to me, poolforum@gmail.com. Shutterfly is not really a link-friendly host service.

I don't recommend the Hayward feeder, because of the tremendous restriction on water flow that it creates. The feed rate adjustment system also tends to work very poorly. Instead, *if* you install an trichlor feeder, use the Rainbow 320:
http://astore.amazon.com/poolbooks?_...g=UTF8&node=61

(Access the complete PoolForum Amazon store at http://poolforum/amz/ )