Question

all methods of softning the hard water

Answer 1

Water softening

Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. ...

The presence of certain metal ions like calcium and magnesium principally as bicarbonates, chlorides, and sulfates in water causes a variety of problems.

Answer 2

Detergent which contains hard and both soft water also

And in another hand soap which contains only soft water are fast take the action of cleansing.

There are two types

That is hydrophobic and hydrophilic

For continuing see in the pic

Please marked as brilliant answer