SEMO Scuba
Contributor
i usually just decend as normal with snorkel in mouth not really bothering with closing of the mouthpeice. then when acending, just before you reach the surface begin to blow out and then expell the rest at the surface. i suppose its whatever comes naturally. hope this helps.
I have snorkeled for 5 years and got scuba certified this summer. In scuba class they taught us how to dive with a snorkel. It was much like described above. If you exhale a little bit as you begin to ascend the air will expand in the snorkel tube forcing all the water out and the snorkel will be dry when you surface.