The hardness originally referred to the ability to precipitate soap and form soap scum.
The harder the water the less soap will dissolve.
Soap is precipitated by water containing high levels of calcium and magnesium. Hard Water is a generic term that means ground water has picked up minerals from the earth similar to magnesium and chalky calcium. You know what’s in your municipality’s water, right? Most municipal treatment facilities are constantly checking for contaminants, bacteria, and identical harmful elements but they can not take responsibility for the materials in plumbing components, and service lines into the home as well. However, while making it hard, Many minerals end up in it. It picks up many naturally occurring elements as they dissolve, as water flows over rocks and soil. Softening involves something called ion exchange to remove dissolved minerals just like calcium, magnesium, iron and manganese that can’t be trapped in a filter bed. Softeners contain fresh resin beads with sodium attached to the bead and as water enters the tank, dissolved calcium and magnesium are attracted to the resin.
The soft, treated, conditioned water you get from a softener will make life easier all around your house.