Boiling water does not reduce TDS in the way you hope. In fact, it does the opposite—it increases it slightly.
When you boil water, some of the water turns into steam and floats away. That steam is pure H₂O. But the minerals and salts? They stay behind in the pot.
So if you start with a pot of water that has 200 ppm (parts per million) of TDS, and you boil off a quarter of it, the leftover water now has a higher concentration of those solids. You haven’t removed them—you’ve just concentrated them. Oops.
Wait, What About My Hard Water?
Ah, the white, crusty stuff you see in your kettle? That’s temporary hardness, mostly calcium and magnesium bicarbonates. When you boil, they turn into carbonates and fall out as scale.
So yes, boiling does remove some specific minerals from the water—calcium and magnesium to be exact. But the total amount of dissolved solids barely changes. Sodium, chloride, and other stubborn stuff stay put.
It’s like inviting a few party guests to leave, but the loud ones just move to the living room. The party is still full.
How To Reduce Total Dissolved Solids (TDS) In Water? | Atlas Scientific
