@n4seth, you ask several questions in your post that have been discussed in the group. I thought you might appreciate this inventory of related discussions:

About Showers and Water Pipes
- Best Shower heads for MAC https://connect.mayoclinic.org/discussion/shower-heads/
- Practical questions about nebulizer, shower head filters & gargling https://connect.mayoclinic.org/discussion/some-practical-questions/

Water, Bacteria and Testing
- Have you had your water tested? https://connect.mayoclinic.org/discussion/have-you-had-your-water-tested/
- Has anyone had their home water supply tested for MAC/NTM ? https://connect.mayoclinic.org/discussion/has-anyone-had-their-home-water-supply-tested-for-macntm/
- Hot water heat https://connect.mayoclinic.org/discussion/hot-water-heat/
- bacteria and water filter https://connect.mayoclinic.org/discussion/bacteria-and-water-filter/
- Water at freshwater lake https://connect.mayoclinic.org/discussion/water-at-freshwater-lake/

Mycobacteria Gordonae
- Now Mycobacteria Gordonae in my culture too https://connect.mayoclinic.org/discussion/now-mycobacteria-gordonae-in-my-culture-too/
- New to Mycobacterium Gordonae HELP needed https://connect.mayoclinic.org/discussion/new-to-mycobacterium-gordonae-help-needed/

Prevention and Reinfection
- How To Prevent Re-Infection of MAC/MAI https://connect.mayoclinic.org/discussion/how-to-prevent-re-infection-of-macmai/
- Possible causes of MAC/MAI Re-Infections https://connect.mayoclinic.org/discussion/possible-causes-of-macmai-re-infections/
- So many questions: How do I clean our home to prevent reinfection? https://connect.mayoclinic.org/discussion/please-help-5/

What an incredible wealth of knowledge and insights in this group!