Hardness is a dissolved-mineral issue.
Hard water usually reflects dissolved calcium and magnesium picked up as water moves through rock, soil and local supply systems. Because those minerals are dissolved, a showerhead screen or particle layer should not be described as a water softener.
Luscentra targets residual chlorine and visible particles. It does not soften dissolved hardness; homes seeking hardness reduction need a suitable water-softening solution selected for the local supply and household plumbing.
Performance varies with inlet pressure, household plumbing and product configuration. Figures based on manufacturer testing of corresponding models.