Think of calcium as the houseguest who never leaves. It’s in most tap water, especially if you live in an area with “hard water.” You’ll know you have a calcium problem when your coffee maker starts acting like a grumpy old timer, sputtering instead of brewing.
It’s not just about taste, either. That scale buildup can slowly demolish your water heater, dishwasher, and even your expensive espresso machine. Replacing those is way pricier than a good filter, so caring about calcium means caring about your wallet, too.
