Nasal irrigation is an efficient method for removing secretions,  pus, scabs associated with rhinitis and sinusitis.

The principle in this irrigation is the mechanical traction applied by the liquid entering a nasal orifice and exiting via the contralateral orifice. For the drag effect to be efficient, an adequate volume of liquid is required (250-500 mL) with sufficient force.

The irrigation liquid not only cleanses the nasal mucosa, it also penetrates the paranasal sinuses, diluting retained secretions and facilitating their elimination.

Therefore, nasal irrigation is not comparable to the assumed wash effect of saline solution nasal sprays which only serve to humidify the mucosa of the nasal cavity.