The S7 can withstand anything!!

It's a Neti-Pot. Very real, very useful thing.

The guy is using a Neti-Pot. It's a thing that resembles a tea pot that you fill with warm filtered water and a table spoon of 50/50 salt and baking soda mix. Leaning your head over a sink while tilting to your left, you put the little kettle up your right nostril letting the water run through your sinuses and drain put the left nostril into the sink. Then repeat on the opposite side. It's pretty good for removing allergens and debris that may still be irritating your sinuses. There is also a bottle Neti-pot that you squeez. I've used them before but they kinda irritated my sinus.