Yes, He had to send fax me the manual, since the product is obsolete and replaced with DE6020.
But it seems as though most of the details in the manual that you mentioned matches this one except for the physical differences between the models.
I was able to put the filter back together, but when I started the pump, the pressure seems to be too high ~35psi. There might be something causing this high pressure. May be because I only replaced 3 of the 8 filter grids (and others I only cleaned with a garden hose and didnt use any chemicals). I still dont undertstand all the valves in my system, and I think my in floor cleaning system (caretaker 5 port valve) would need rebuilding/replacing.