Because when the mucus membrane is too acidic, that is to say when the PH-value is too low, the virus can survive and become attached to the mucus membrane and thus develop into an infection. Contrarily, if the PH-value is higher, the virus dies. With this background it is also clear why neti can consistently relieve psychosomatic ailments such as asthma since during asthma attacks the mucus membranes become swollen, and make breathing difficult when the air passage is obstructed by mucus. The effects of neti are as you see very comprehensive and can be employed for many purposes. You fill the pot with luke warm water and dissolve a teaspoon of ordinary salt there in.
Sea salt is unsuitable for nose cleansing.
We have repeatedly experienced that people got a strong allergic reaction when they had sea salt in the pot - with ordinary salt, on the other hand, there were no problems. This might be due to the increasing pollution of the seas or a pollen content of the sea water. Do neti over a sink. Hold the pot in one hand and place the spout against one nostril, so that it fits tightly. Now the water will flow by itself, in through one nostril and out of the other.