GE Softener using too much salt

[dvscuba]

My model GXSS17Z01 SmartWater softener is using almost 50kg (110lb) of salt each month. Our local hardness is between 40-45. House of 3 people set to regenerate 3 days/week. Water level in brine/salt tanks is normal. Water doesn't really feel very "soft" either.

Any ideas?

Thanks,

DV