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It is NOT a BIG Deal!!

As soon as you get back to shore or back on the boat, rinse your 2nd stage with fresh water by putting the garden hose in the mouthpiece and let it run until the water runs clear. 

 

Never push your purge button on your 2nd stage while you are rinsing it.  

 

WARNING failure to do this, you will be damaging your life support system.  Vomit is very high in acid and it does damage to your 2nd stage.  Failing to due this easy steps can cost you a lot in repairs.