These refills are suitable for individuals experiencing congestion due to various reasons, including colds, flu, sinusitis, hay fever, allergies, and nasal surgery. By irrigating the nasal and sinus cavities, they help clear congestion and promote comfort. With 100 sachets in the refill pack, users have an ample supply of gentle cleansing solution for ongoing nasal and sinus care. Overall, FESS Sinu-Cleanse Gentle Cleansing Refills provide a convenient and effective solution for maintaining nasal and sinus health, offering relief from congestion associated with various conditions. As always, it's essential to follow usage instructions and consult with a healthcare professional if you have any concerns about your nasal health.