Question

One of the following used for removing permanent hardness of water

Answer 1

Temporary hardness mainly causes the dissolved calcium hydrogen carbonate that is mainly removed with more options.

Permanent hardness are highly caused with dissolved the calcium sulphate.

Normally, the water mainly has softened with washing soda or an ion-exchange resin.

It is the presence of Megnesium, carbonate, Calcium, and bicarbonate ions along with many other aspects.