I run carbon 24/7/365 for toxins and DOC's. I have for over 30 years. I use a BRS single reactor set up so that the flow is reversed from the "normal" pattern. That is - the water comes down through the carbon, thereby keeping it from moving at all. Not only does it prevent problems like above, it allows for somewhat higher flow through.I run carbon. But I do not use an reactor. All reactors I tried sucks for running carbon. A filter bag is way easier.
I actually started with an AquaMaxx reactor for carbon. But it has the same problem of Phosban and BRS reactor that, it can't hold the carbon down when only partially filled up. The carbon always pushed up the foam, then leak and got into the sump. Every time of changing media is a mess.
Filter bag is so much easier to work with. The cons is less efficient. But I only change carbon every 2 weeks or longer, but it probably got used up after several days. So having it to work slower, thus last longer, is not a bad thing to have IMO.
I also use GFO if needed, in a tlf 150 with the flow in the usual direction - up through the media so that it tumbles slightly.
Before reactors were a thing, I used a couple canister filters for the same thing. They worked ok, but were a PIA to clean. When reactors became available (my TLF 150 is probably 28 years old? I made the switch and never looked back. Those canisters now get used only rarely, stuffed with pillow stuffing when I'm doing a major cleanup. They run for a few hours and then go back in the box in the basement (clean and dry of course!)