There are at least 80 patents filed with the US Patent Office just for "Permanent Magnet Fluid Conditioners". One of the first patents on this science was US Patent No. 531,183*, which was filed October 17, 1890 and was granted Dec 18, 1894. One of the newest patents granted in this area is US Patent No. 6,716,346* which was granted April 4, 2004. So these devices have been in use now for 115 years and there are still new patents being applied for. There is a whole other group of patents for these devices that use electro-magnetics in place permanent magnets.
If you do a search for "magnetic water conditioners" you will find (have found) many vendors of these devices that provide explanations of the science behind them (some better than others). What you typically will not find is any real specifications by which you can compare the products of the different vendors of these devices. What is even worse you will typically find statements that says that what ever their competitors are doing just will not work. These statements are just bald face lies that are not backed up by any scientific test data.
water softening systems.