I did a Google search, as much positive as negative on these devices. Did not spend enough time to see if I could find a certified test lab results, but lack of these could speak volumes.
In any case, we installed a Sears water softener and whole house filter. Two months after, Sears came out with a combination unit.
Results, very soft water, very good tasting water, no salt in the water (by testing).
We use 4 bags of salt (40# bags) about $5 each every 6 months. Very happy with this system.
Cost of 2 separate units was around $850, combo unit is less.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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