Some doctors are not enthusiastic about nasal saline irrigation since researchers found that it does not significantly reduce the incidence of colds. However, do not confuse colds with sinusitis. Viruses cause colds, while sinusitis is a bacterial-induced complication for some colds. Irrigation of the nasal passages with saline cannot kill viruses or bacteria, but it does help to reduce the incidence of sinusitis in people with a tendency to develop this common complication of colds.
Sources: American Family Physician (70:1685 & 1697, "04) & Wall Street Journal (Dec.7"04, page D6).