The answer to 'what is water softener' is a device that removes minerals like calcium and magnesium from hard water. Water softeners work by using an ion exchange process to replace these minerals with sodium or potassium, resulting in softer water that is gentler on your skin, hair, and household appliances.
Water softeners are commonly installed under the sink or in the basement, and they require periodic maintenance like adding salt to the brine tank. They can help extend the life of your plumbing, water heater, and other water-using appliances by preventing mineral buildup and scaling.