What ions are removed by a zeolite water softener?

A zeolite water softener works by using a natural or synthetic zeolite mineral to remove hardness from water, primarily by exchanging certain ions. The correct answer identifies calcium and magnesium as the ions removed by this process.

In many water supplies, hardness is mainly due to the presence of calcium and magnesium ions, which can lead to scale buildup and other issues in plumbing and appliances. When water flows through a zeolite softener, the zeolite resin has sodium ions that are exchanged for the calcium and magnesium ions in the water. As a result, these harmful ions are trapped in the zeolite, while the water that exits the softener has a much lower concentration of hardness, effectively softening the water.

This process is essential for protecting plumbing systems and improving the effectiveness of soaps and detergents. By understanding that calcium and magnesium are the primary culprits of hard water, it becomes clear why the answer focuses specifically on these ions.