Personally I would say ask the piercer or your doctor. I use salt water on my piercings for the first couple of weeks but then aftre I do not clean them - may sound disgusting but I find the cleaner they are the more problems I get, so I don't. But with sea water not being very clean I woudn't be sure. But I can't imagine it being any more dirty than applying make up to your face, I would suggest just making sure that you clean the piercing and the ring/stud afterwards. The best thing to use on the go would be dettol spray and cotton buds.