If you search the board for water softeners you will get plenty of hits. Look out for the posts from Zenn and GWS as they are fairly expert in the area.
Are you treating well water or mains water?
Regardless you should first get your water tested (reputable, independant, accredited laboratory) to determine the actual hardness present. And then test afterwards to determine whether and to what extent the treatment is working. I would only get an established reputable professional water treatment contractor to fit the system.
In general I would be wary of the the little gizmo pictured. It sounds like "fairy dust" science to me!
[FONT=Arial, Helvetica, sans-serif]The system operates quietly around the clock, increasing oxygen, reducing molecule size, activating the metabolism, increasing alkali in the water and discharging beneficial negative ions - all of which have known health benefits.[/FONT]
[FONT=Arial, Helvetica, sans-serif](Reduced molecule sized water is readily absorbed by the body, increasing hydration and promoting good health).
Reduced molecule size? Huh? For water? I would be leery of any dodgy contraption that altered the angle of the bond for H2O , it is only liquid at room temperature because of that odd configuration it has and if you let that out into the environment ... Let's just say you would be interfering with ecosystems by altering the way water behaves when it freezes!!! Sounds like a load of baloney to me, the whole paragraph is a litter of misused words strung together without any nod of the head to either science or sense