I've  used EIS with saline powder for nasal wash using netti pot and the 
electric sinus spray (similar to the  dental pik).  It helps for a few days but 
have to repeat treatment.
 
I only treat when i have bad rhinitis or sinusitis.
 
I also use EIS with a teeny weeny amount of 200,000 HU of cayenne pepper 
oil (using toothpick end) and 2 tiny drops of oregano oil as nasal spray.  This 
is instant unclogging of nasal membranes.
 
Melly