I've been running the BRS Pellet Reactor for 3 months with the BRS brand pellets. Mine is unmodded and running just as well as it did day one. I don't see ANY reason to mod the reactor. The reason some of you complain of clogging is probably due to not having a strong enough pump or it not being leveled. I do not intend to offend anyone but this mod is a waste of time and stress. I also hope some of you don't just dump a bunch of pellets and expect results. You have to start off with 1/4 recommended amount, wait 4-6 weeks and put another 1/4 more and so on.... I highly recommend not modding it and getting a bit stronger pump or plumbing it to run off the return pump like I did.