All you installed is an iron filter. As it says in your photo
^Unless his water looks like that out of the tap this isn't the product to use.
It doesn't soften water at all. For that you need a dedicated water softener
reggiesmegawaterpurifier.com
^Unless you installed something like that you did not soften any water. Just filtered it for specific elements.
This is that resin business that
@yugaaa was hinting at but never gave any source.
These are all custom jobs by various small companies around the country. This
particular one is based in Chennai. You will have to find a local equivalent.
^only filters iron, manganese & sulphur