That was how I always pumped out. When finished I then do the reverse to rinse the hose out for the next guy and then rinse it all off with fresh water rinse. When you stick it in the ocean, then it should be on so that it is sucking, how is that going to pollute the water?
Because the head of the hose is contaminated with bacteria (regardless of how much fresh water you rinse it with).
Note step 5. in Hardworks post. What are you "rinsing", and where is it going? Interestingly, his method doesn't really "prime" at all, which I suspected wasn't necessary, thereby eliminating the first step altogether. Not a big deal, but I was just curious if I was missing something. So far, I don't think I am. My method seems a lot faster and more efficient, and I still don't see any reason to be dipping the hose in the drink!