I have been using the A9 model on an 18 yo kitty with CKD. His kidneys have returned to normal. In the four weeks before recheck, I added Azovasto probiotics. Perhaps it was the treatments enhancing the Azo as the Azo says results are best after 8-12 weeks. Unfortunately, this little boy has lymphoma in his chest cavity area. I am now placing the magnets in this area. I’m still using the M setting but would be interested in any guidance on placement, strength and duration. I am thinking of getting the 2x2 arrangement if that would help.