The folowing video demonstrates with the use of a large nose prop, how neti clears the sinus passages.
Dr Oz goes on to discuss the type of water to be used which I disagree with. Personally I continue to use "body temp tap water".
As long as the water looks clean and is clorinated I think that's fine for me. Remember, Jala neti originated in India where the water is not so clean.
Also, I don't know about the baking soda mentioned, never tried it.

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