[jimbo2012]

The Nuvo is primarily a softener, with minor filtering.
The softener uses Citrus cartridge unlike all other softeners there is much controversy as to how a citus based system does NOT remove the calcium & magnesium,

But

[I"The NuvoH2O system binds and isolates the hard mineral ions with a process known as chelation. Once bounded to CitraCharge®, NuvoH2O’s binding agent, the mineral cannot form scale". [/I]

In other words it claims to encapsulate or suspend the calcium, but it's still remains in the water.

The phrase salt-free water softener is a bit of a misnomer. This is because salt-free water softeners don’t technically soften the water. Instead, they condition the water by crystalizing the calcium and magnesium ions to keep them from forming scale within a plumbing system.
So, salt-free water softeners should really be called salt-free water conditioners.

Last point, the Nuvo system does not have a sediment filter, that is very important here in TV.

Salt & potassium softeners have been in use about 100 years, time tested.