I made my own reactor for both carbon and GFO by converting old RO in series canisters. You can see this on page 2 of my journal (link below). These are very similar to what BRS sells. Very simple to unscrew a canister and refill the inside container (or remix), and clean the sponge filters without any carbon or GFO residue escaping into my tank. And it is fed by just a T off my return pump line, so no extra pump required. Works very well, and totally problem free. And dead simple...
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