"It reminds me of 'magnetic therapy'. There may be something to it all but I've never found any really good evidence."
Watch a couple of John Waynes last few movies, maybe "True Grit" and some others where he was getting older. You can sometimes catch a glimpse of a Magnetic bracelet he wore for arthritis or wrist problems of some type. Proof enough for me! If good enough for John Wayne it's good enough for me, and of course if he was here today I would not fight him over it
Really though I have heard that it did work to help him with artharitis I think it was or something similar.
I know the magnets on a feul line do work to improve mileage a bit, I do that myself.
The water stuff, who knows, I got Lowes bars ceramics on one water line here, but forgot about them and know idea if they did anything or not.