My two kids came down with severe daily coughs for ten months and it was the chlorine our water company had started putting into our water supply. Check with your water company to see if they chlorinate their water. Maybe you are also sensitive to chlorine.
Even if pool water does'nt bother you it could still bother you if its drank. Thats the way it is for my kids.

After seeing their pediaticians numerous times they started coming to a conclusion that they were developing asthma! WRONG.

They have been cough free for 9 years except...when they accidentally get a new source of chlorine (school, friends home etc)or temporarily sick with virus cold etc.

For some strange reason they are hyper sensitive to "Chlorinated" tap water. They drink it they start coughing. The coughing was so bad it would take hours for them to fall asleep.

After stopping the ingestion of the tap water and replacing it with chlorine free bottle water their coughs were gone in about 48 hours.