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It's strange what mask clearing can bring about. I hate demonstrating mask clearing in the swimming pool, something I have to do regularly when instructing because my nasal membranes seem to be particularly sensitive to chlorine. The next day, may nose is always bunged up. What is curious is that I can swim around without a mask on breathing through my DV with no problems but when I replace my mask and clear it, even with a single strong exhalation, the action seems to create some sort of turbulent motion which results in some water coming into contact with my nasal membranes. Fresh or salt water causes no problems whatsover.
Agreed - cold water is definitely different to doing it in a pool.
Originally Posted by WFO
I did my mask clears no problem in the pool (approx 20C) but the first time I tried it in open water (approx 10C) was a serious shock to the system - so much so that I struggled to stay down due to the big intake of breath.