answer for the very first post, first, wipe the bridge of you're nose with alcohol, and than after washing the mask,apply alcohol around the whole rubber
diaphram that makes contact with you're face, this will stop the nose issue and stop the mask from leaking, helping you sleep better at night.
my pressure is at a constant 16, i have to wear a full face mask, had severe problems with leakage and nose gashes" people actually thought i had
a rifle scope wound. lol.... ps. good luck, it worked for me