If I want to use hard water for textile dye processing,then i will removed hardness of water with some treatment. Here is given below,

There are two types of water hardness.

1.Temporary hardness: Temporary hardness can be removed by boiling the water.

2.Permanent hardness: Permanent hardness can not be removed by boiling the water but it will be removed by only chemical treatment. 

There are some method for how to do soft hard water given below,

Temporary hardness:

1. Ca(HCO3)2 + Ca(OH)2 → 2CaCO3 ↓ +2H2O

2. Mg(HCO3)2 + 2Ca(OH)2 → 2MgCO3 +2H2O

3.MgCO3 + Ca(OH)2 → Mg(OH)2 + CaCO3 

Permanent Hardness:   

1.CaSO4 + Na2CO3 → CaCO3+ Na2SO4     

 2. MgSO4 + Na2CO3 → MgCO3+ Na2SO4   

3.MgCO3 + Ca(OH)2 → Mg(OH)2 +  CaCO3