If saline is used to clean the nasal cavity of sinusitis patients, it is best to use a professional nasal rinser, these nasal rinsers are easy to buy in hospitals, drugstores or online, you can choose the number of times a day to clean and the amount of saline to use according to the severity of sinusitis, the amount of secretions in the nasal cavity, you can clean the nasal cavity 1-2 times a day, and each time, you can choose 200-500mL of saline. The amount of saline should be 200-500mL each time. Before rinsing, it is best to warm the saline moderately, if the temperature is between 30-35 ℃ saline, feel more comfortable when rinsing. When the nasal cavity is cleaned out more secretions, you can rinse a few more times and clean for a longer period of time. When the secretions cleaned out are less, you can reduce the number of rinses and the amount of saline used.