I think I might have found a thread that can help me with a little problem I'm having. I began snorkeling way back in the early '60s with a simple Voit snorkeling set with a standard, old-fashioned J type snorkel. When I started SCUBA diving a couple years later, I was given a US Divers J snorkel that I still have and use to this very day. I have never had any trouble clearing it either with the displacement method or the old "whale spout" method. One blow and the snorkel is completely clear and ready to breathe. My problem comes from trying to use a new snorkel I bought recently that is supposed to be dry (it isn't) and has a purge valve. When I come up from a (snorkel) dive and try to blow it clear, there is still water left in the mouthpiece. I have to take a very slow breath at first, then blow again to get the last of the water out. I bought it primarily because of the flexible "accordion" tube at the mouthpiece. The stiff J of my old snorkel can be a nuisance during SCUBA and I thought the flexible one might be a bit more convenient. For awhile, years ago, I used the old one without a keeper and kept it tucked into my weight belt and stuck it under me mask strap when I wanted to use it. I almost lost it during a dive once, so stopped the practice. That old snorkel has a lot of sentimental value to me and I don't want to lose it.
So my question is, what am I doing wrong with this new-fangled contraption? Is there a special technique to clearing a snorkel with a purge valve?