If you want to know what causes sinusitis, and why the saline solution
works, go to Part II of this journal.
1. MAKING YOUR OWN SALINE SOLUTION
WARNING: Do not use tap water, unless it has been boiled first. There is a rare microbe that can get in your brain from some water systems.
Saline solution is salt water. You can buy a bottle of saline solution in a drugstore, and it works just fine.