It looks like a waste of fifty bucks. And I don't care for lots of things touted by Oz and Opra. Pink salt is no big deal. It just has a few minerals for color.
It's not expensive at all to just buy the aerosol saline sprays. They clean out the sinuses nicely.
If you have excessive phlegm see a real doctor and find out if you have a sinus infection. These infections, by the way, are often not cured with a single round of antibiotic. It's common to need a second round. I just got through with this. Had a headache for a year, no single treatment got rid of it.
GERD, as Joy said, is another good possibility your doctor can diagnose.