H2S can be smelt in concentrations as low as ppb (parts per billion). It definately is a gas that is not something to laugh about. I happen to work in an oil/gas plant where we have vessels containing 800,000 ppm. (yeah, more than enough to kill a small town off)
That being said, I do not think these reactors have the ability to make it in such high concentrations. Perhaps maybe if it were to go for weeks on end without being noticed. (pump failure) And then you opened it up to atmosphere, but even then I doubt it. Just keep your nose out of it and clean it in the bathroom with a fan on and you'll be fine. Kalk or Carbon dust is probably more harmful to your lungs than the small dose of H2S these would give off. If you are diligent and check your equipment regularly, I don't think there would be a problem.
There was one person on a forum who's reactor stoped recirculating and was sending H2S into the tank. His fish developed lesions and his corals didn't look so good. Once disconnecting the reactor things cleared up right away. (I believe he may have lost one fish) So in a sense you should be able to spot the problem before it becomes serious. Just think, his fish didn't just suddenly die, and the LD50 would be super small for fish compared to a human. (body mass)
I am on the verge of ordering a unit from Midwest Aquatic...
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