ezadel
Registered
I guess I dont have this habit and/or trying to break it. I should have been more clear I usually breath in/out from my mouth..only last dive, i tried this technique and it felt really good so thats why I startes the thread. I do like the purge valve ans i think I can control myself not to exhale from nose if I wanted toI agree you should get a new mask. Without the purge valve you'll probably find that exhaling too much through your nose contributes to mask
leaks. Every time the mask skirt opens up to let out air a little water can leak in. This is especially true when the air in your mask leaks out the top if you are in a head up position. Then you have to keep clearing the mask....
So having a mask without the purge valve might help train you to limit your nose-exhaling just to help stop leaks.
I really would not worry about CO2 retention caused by exhaling through your nose.