I have the same problem.Finally gave up and started using noseplugs.

Dave

I used to get headaches and congestion after a pool swim, but since I started using a noseclip, no problems whatsoever. Yeah, I felt kind of geeky at first, but I got over it. The competition style (no strap) by either TYR or Speedo goes for $3-$5, a small price to pay to be able to breathe the next day.

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Dave in WI
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"What you once were isn't what you want to be anymore" - Wilco

Hi,

I suffer from this problem as well. On one occasion, the chlorine irritated my sinus whicht in turn caused an inflammation. Three days later I develop an infection that spread into my inner ear. When the swimming coach phoned to ask why I have not attended a session, he was not surprised at all that I had a problem an inner ear infection because of the pool. I did not want to stop training for triathlon, and nowadays I use nose plugs - I am not aware there is any other solution. Whenever it is possible I go to swim in the sea where I can get rid of those plugs.

Paula

Try using a saline nose spray immediately after getting out.

Flonase worked for me but at $10/mo (based on my insurance) is a more expensive option than nose plugs.