The core of my business... hardly. I sold like a hundred softeners for each chlorinator or filter.
From the mid 1990s I sold the erosion inline pellet chlorinator because it was and is the best choice for anyone needing that type of treatment. Much less maintenance, no baby sitting like solution feeders, no varying strength of solution problems, no large retention tank if the mixing tank was used, no dumping the retention tank to get the strength correct after something went wrong like not enough chlorine, on'n on.
That was after selling a fair number of solution feeders back in the late 1980s along with 1 greensand filter that couldn't do the job and then many Pyrolox filters regenerated with chlorinated water out of a salt tank.
BTW, Andy and a bunch of others were banned so no pissing contests here anymore. Good luck with getting info from industry insiders not trying to sell something; but really, think about it, who knows more about a product than someone that sells and/or services it?
Hydrogen peroxide is not a good an oxidizer as chlorine and it costs more than chlorine because you usually need a stronger strength than say 5.25% bleach for a solution feeder.
Ask the solution feeder guys why the carbon filter when peroxide is supposed to be better. Ask yourself if they are just trying to sell something or is is due to the peroxide maybe not getting all the H2S; which is normally the case.
The nose, a female nose is best, is the best test for H2S and it doesn't matter how much you have unless ya wanna brag about it later, you need to remove all of it.