I know this is old but I've been looking. They sure want a lot of money for what seems to me ought to just be a transformer providing the correct amps to the wire wrapped on the pipe. In my reading, I've repeatedly seen it commented the government has successfully created such a system for the military. I think they mean a government contractor either has built one that works, or has successfully demonstrated to the military at least the appearance of it working. The main problem I see with systems for purchase for residential use is no effort to provide suitable means for removing what the field has removed from the system is made. It seems to me, if you successfully pull the calcium, magnesium (most of the stuff that makes water hard is one of those two) and whatever else, you'd want to get it out of the system or you'd end up with gritty water or a closed up pipe under the wire wrap eventually. Seems to me if such a system works at all, you'd just need to know the proper current, probably a matter of knowing the right amps. And I wouldn't be shocked if you told me the size of the pipe might change the requirement. Then you'd want to at the least provide a spigot so you could perhaps weekly turn it on to flush the system, then turn off the machine which would be wired just prior to it on the incoming water main line. That way, you'd flush what it removed out. Seeing as what you remove is what creates scale on the inside of pipes, water heaters, etc, I think you'd probably also be ahead if you made the section of pipe wrapped easily removable for replacement or at least some type of cleaning. Anyone know what current is needed for a 2 inch pipe?