There aren't any. The magnets and electronic anti-scale and descalers are not softeners. They do not make water soft because they do not remove any hardness.
They are supposed to prevent and remove water hardness scale but...
The best softener will have a Clack WS-1 control valve on it and correctly sized for your water quality, family size and your SFR (service flow rating) needs.
Moderated by Handyman 
