Chlorine Allergy - Any suggestions?

I have this problem on occasion. In one pool I was always congested, in another I was never congested. I don't know the answer to why. I do know that the more I kept swimming the problem basically went away. When it flares up I use a saline nasal spray which helps a little. Others have used allergy meds like Claritan, but I really don't like taking meds unless desparately necessary. So I either suffer with it when the spray doesn't work, or often am clear whether because of the spray or cleaned pool I don't know.