Thanks to everyone for all the advice.
We ended up draining our pool, and refilling it.
We are now using a nature 2 cartridge, and will leave the free chlorine level to 0.5 ppm as recommended by endless pool. We also have a UV filter.
I understand that most people are actually allergic to the Chloramine.
I was a swimmer for 15 years, and I spent about 4 hours a day in a pool. I always had a stuffed up nose because of some kind of allergic reaction. Most likely to Chloramine which back in the 70s and 80s must have been out of control in public pools.
Thanks again for your insight in all of this!