The chloramines produced by chlorine don't just cause that indoor pool at the local YMCA to reek like a chemistry lab; they also irritate nasal passages. So, it's best to swim in a different kind of pool or take a break from water sports until you feel better.
On the other hand, saltwater pools might actually provide some relief. Rather than rely on the chemical chlorine, these systems produce chlorine from salt when water runs through a special electrically charged cell. This process keeps the chlorine level balanced and chloramine levels low [source: Pool Supply World].
If you're stuck with a chlorinated pool on your upcoming vacation, look for one that's well maintained — good ventilation and a proper chemical balance can make a big difference to your sinuses. Ideally, find a spot that diligently enforces its pre-swimming shower policy. Some swimmers complain that perfumes, body sprays and the like can leave a "slick" on the water that irritates nasal linings.
Aside from the chlorine, excess pool water up the nose can irritate your sinuses, too. The other main way to cope with water up the nose involves using nose clips, available at many sporting goods stores, to avoid the up-the-nose part. If all else fails, some of the tips on this list can help you deal with the aftereffects.
Sinus Congestion Tips
Here is some information to help you with sinus congestion.