I Have a Deviated Septum, and Always Have Mucus in my Throat. What Causes This?

Almost every day I have to excessively clear my throat because there is mucus in my throat, which I believe is from my deviated septum. I am getting a septorhinoplasty soon but worry that it will not fix this. Has anyone seen/fixed a similar problem? Is there a specific location of the septum that causes the mucus (or post nasal drip) to form? Would this have anything to do with my turbinates? My PS didn't mention them, but said that he would be using a spreader graft- (?)

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