my GP recommended a nasal lavage when I started showing symptoms of allergies 5-6 years ago...rather than a Nettie pot which is like water boarding yourself, I use a squeeze bottle and my head up right..

I warm distilled water (don't know the accuracy of a report of parasite that are not destroyed by city water process, but distilled water is cheap)... to which I mix with 1/4 teaspoon of baking soda, and 3x 1/4 teaspoon of canning and pickeling salt that does not have any anti-caking agent... has done wonders, as I've spent a lot of the last year, outdoor in the yard reading under a camphor tree