I have the BRS reactor, theres nothing particularly unusual about it. You can asemble one yourself if you can find the larger 1/4"id or 3/8" poly tubing used. the main components are the refillable DI resin canisters (take the fine mesh out and use a coarse sponge cut round) inside two std. water filtration canisters. Just get the ones meant for higher flow and have the large threaded holes, not the 1/8" NPT small ones
the MJ 900 pump hooks up directly into a john guest coupling fitting on the end of the hose just like a piece of tubing would.