A non-sterile, water-based, salt solution (e.g., isotonic or hypertonic mineral-rich purified sea water) intended to penetrate, clear, clean, and sometimes hydrate the nasal passages and sinus cavity. The solution is typically self-administered (e.g., via a squeeze bottle, glass bottle with a mechanical spray pump, dropper or aerosol) for preventive or symptomatic nasal care. After application, this device cannot be reused.