Shirley responds:
"...I use an Aqua Rain set up. It is about 12 in. diameter and maybe a little taller in the holding tank. It is circular. I don't think it ever bulged, but it has split on one side and is currently being helped with duct tape. Haven't decided what to do yet. Maybe get someone to weld it, but that raises other concerns. Still gets out the chlorine so that's good. I haven't tried the magnets on an empty tank. That's a good idea...Actually, I will go now and empty it and try it with no water in it...Well, that didn't take long!! The magnets act the same way as before. They still lose strength going down to the bottom. I had thought that maybe the magnetism was being dispersed over the whole metal thing, but can't see why the dispersal would increase when the magnets went lower down on the metal...I was aware that not all stainless is magnetic, but hadn't really put that together to mean anything. There is no heating element anywhere on the unit. I do not discern any difference in appearance. If I remember correctly, it is supposed to be made of a single piece of metal and it has no seams, but I forget how they formed it--pressure I guess...P.S. I use the magnets because the n pole is supposed to energize the water in a beneficial way..."