@thumperguy The report posted by @rits in Two Bits of Good News (https://cdn.prod-carehubs.net/n1/748e8fe697af5de8/uploads/2020/05/Hypertonic-Saline-versus-normal-saline-in-Bronchiectasis.pdf ) states 0.9% is as good as 6% to help clear mucus for people with bronchiectasis. It didn't deal with MAC. Only 7% saline has the potential to keep MAC under control because MAC can grow in lesser salinities.