Hands-free equalization (BTV, VTO) means keeping your eustachian tubes open and balanced so your eardrum stays neutral. This way, you don’t need to pinch your nose while freediving, even as you go deeper. The main benefit is that you can keep your hands free and wear a mask without needing a nose clip. Sometimes I used this equalization technique when I go deep and Fundives and also I have small nose and sometimes I couldn’t pinch it properly so I switch the equalization technique from Frenzel t

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PPT - Equalization Techniques PowerPoint Presentation, free download - ID:4342866