When flowing through the limestone layer, which contains dissolved CaCO3 and MgCO3 is the Group of limestone causes Ca2 + and Mg2 + are dissolved in water, thus making the increased hardness.
When flowing through layers of limestone CaCO3 and MgCO3 are born with the dissolution of limestone made Ca2 + and Mg2 + dissolved in water. As a result, the relentless rise
When flowing through the limestone layer, which is CaCO3 MgCO3 will eat and dissolution of limestone, it is Ca2 + and Mg2 + dissolved in the water, so the hardness increases.