My MOm, had dibillitating rhuematoid arthritis for many yrs. I recently moved back, to her house, which has a water softener, for many yrs. The drinking water was diverted, many yrs back. My cat started having (thyroid) problems, and had been drinking, from the tub water, for a few monthes. I was wondering, if somehow, the water softener, may have contributed to my Mothers' rhuematoid arthritis and my cats, urinary and thyroid problems. Since it does contain a source of sodium, it seems probable to me. Has anyone every done a study, on how many people who have softeneres, develope arthritis? It would be a worthwhile study, no? Or how it effects animals, who drink it? I do not drink the water. thanks for your thoughts. susan at ivyslant@aol.com