Regular saline irrigation does not work in the upper sinuses, because of gravity, but the Sinus Flush defeats gravity. It is effective with
viral infections, and some but not all fungal infections.
The Flip-Turn is the original, and still the best Sinus Flush.
The technique in this manual involves bending over in a hot shower. Obviously, if you bend over in a shower, there is a slight possibility that you can get dizzy and fall down.