2. What are the advantages of a swimming snorkel with a one-way purge valve?
For expert swimmers,even if swimming skills are superb, if someone swims nearby or youself accidentally stir up a lot of water, it also causes water to enter the snorkel. If there is no one-way purge valve, the water will not be drained in time, which will cause choking water and coughing, which is a terrible thing.
For swimming beginners, there are two problems,the first is breathing and hand and foot movements don't work well together,the second is choking water. Use a swimming snorkel with a one-way purge valve first can solve the breathing problem, and second can solve the water choking problem, during the swimming exhalation, the water can be discharged from the one-way purge valve. Then you can focus on hand and foot coordination and learn to swim faster.
Snorkels without a purge valve often cause water choking problem. It does not help you learn to swim faster, it also requires repeated manual drainage, which is annoying.
The Focevi swim snorkel has a one-way purge valve.