Hi - I started taking 2 teaspoons ACV in 8 ounces of water 3X a day (I tried taking 2 tablespoons but it was too much for me and dried my mouth out) to irrigate my sinuses, and while it helped, it did not "cure" my problem. I had tried many sinus irrigation remedies in the past, but the sea salt always irritated my nasal passages, so now I am using 1/4 teaspoon of HIMALAYAN PINK SALT in 8 ounces of lukewarm water with just ONE drop of ACV vinegar to irrigate each side of my nostril/sinus. I used a squeeze bottle instead of a Neti pot (much more effective! ) Not only do my sinuses feel immensely better, but the horrible thrush and dry mouth cleared I had cleared up! My tongue is nice and pink now instead of having ugly whit spots and hurting when I swallowed or ate certain foods. I suspect that my sinus infection had been drainng into my mouth, and that is why this rinse worked so well. Good luck to everyone here who is suffering!