My husband has been spitting up green mucus for the last week we're all but two days away from the last treatment .. I've also saw it green color in the peg it's don't have a foul smell or anything so I did rule out infection so I did some research and found that it's from the stomach of course and found that drinking or flushing plenty water in will make this better.. Also Gatorade is really highly suggested .. It's worked for my husband so far over the last few days we haven't seen any more green in the peg or in the mucus ...