I purchased this to help with my asthma just to see if it work.
To my surprise it actually helped with sinus and nasal congestion. Did not do anything for my asthma.
This can actually get a bit messy because the salt dust falls out. As a result I do not use it that often. Only if I get a head cold.
I find Hydrasense rinse is best for allergic rhinitis and more convenient.
I am not sure I would recommend this since the results were not as drastic or noticeable as I had hoped.