It seems like this bag will last a long time! Is use less than recommended for my sons tub, to be safe but so far here is what I’ve noticed- I have been adding it to his bath water in hope it will help with his molloscum and it HAS shrunk and some are getting that irritated look (which is a good thing) and then healing. I have been using this in conjunction with the skin virus drops and tea tree & I can definitely tell a difference. I’m excited to see how much these salts help when/ if we are battling illnesses. But also the hope is that this helps prevent them as well!