A method and solution for treating nasal infections efficiently is provided. The method includes providing a first solution comprising 0.1 to 2 wt % sodium chloride and providing a second solution comprising 2 to 8 wt % NaOCl. A first aliquot of the first solution and a second aliquot of the second solution are mixed to provide a therapeutic solution comprising at least 3-600 ppm free chlorine. The therapeutic solution is introduced into a sinus cavity containing an infection.