You don’t even need equipment for this one—just your eyes and a glass. Fill a clean glass with tap water and hold it up to a light. Look for tiny, floating specks that look like white dust or glitter.
Those specks are calcium carbonate particles that didn’t dissolve. Water holds minerals in solution, but if it’s too saturated, they just hang out like uninvited guests. In extreme cases, you can see what looks like a miniature blizzard in your drinking glass.
If you see that, your water is not just hard—it’s aggressively hard. It’s the kind of water that leaves rings in your toilet bowl that look like ancient tree rings. You might need to call a plumber, or at least buy a lot of vinegar.
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