I got a Mini-Jet 606 for my Phosban Reactor 150. If you’re going to run GFO you can get by with the 404, since it is supposed to have lower flow than the bioplastics I’m running. I wish my 606 had just a little more flow than it does. If you go with one of the other reactors I’m not sure what pumps they recommend.
And yes, you can run Chemi-Pure Elite in a reactor. I have heard some recommendations for it from sources I really trust. I’m not sure exactly how it compares to running straight GFO, though. I plan on running it, either as a second stage in the same reactor or in a second reactor. I just haven’t decided which way to do it yet.