@andyj Hi, I see an NTM specialist in NYC at NYU. When I was first diagnosed in 2016, I asked him about going in the hot tub wearing a mask. He laughed, and said he “was never asked that question” and then said he wouldn’t recommend it, but, it’s up to me if I wanted to take the chance. I decided not to take the chance. Thankfully, I never had, and still don’t have, any symptoms of an active infection. I’ve never been on the antibiotics. I DO have lung nodules, which they watch with CT scans yearly, (or sooner if necessary depending on what shows up). I also have bronchiectasis so I use the Aerobika twice a day for lung clearance and I alternately nebulize .9% and 3% saline daily. I guess, ultimately, it’s up to you if you want to take that chance. I was also going to look into salt water hot tubs but never bothered. That might be something you could consider if you REALLY can’t give up the the hot tub. Good luck.