This is all well and good about the Sanitizer, but I prefer something I know from past experience that works everytime. I do not sell something that if this is that way then use this or if it is that way use that. I stay away from medias that are heavy, KDF, Filox, Pyolox...etc because most residental well I have seen don't have enough flow rate to properly backwash these medias. Chlorination is the best way to deal with h2s and high iron.
H2S and iron levels in Florida can be extremely high. Typically a sanitizer is designed to handle up to 5ppm H2S but that is asking a lot of it. I would agree that with high H2S and high iron levels a chlorine injection or hydrogen peroxide injection system would be the best application. An outdoor venting/airation system for high H2S is also an option in warm climates as Florida.
RJ