Wee ran into the same problem in south Georgia, Florida and La.
We used two filters a 5 micron charcoal that ill get just about everything including sulfur and iron. It stopped up in La, done it's job and a second ceramic filter was then put on and it stopped up and was covered in brown and black and yellow sulfur, iron and other minerals, to the point I couldn't clean it..
So we carry more good charcoal filters 5 micron, and smaller, when I can get them, and replace a necessary. The blue one, I don't remember the number, that CW carried that fit the 10 inch housing was good but too expensive at near 40.00 each cartridge. Don't remember where I bought the last ones but Folks here, have posted several online sources. I recommend a prefilter that is cheaper, to get most of the bad stuff, at the faucet and the second closed to RV to get the smaller micron stuff. I don't always run two filters nd right no need a second housing.