Pull out a glass from the cabinet. Is it crystal clear or is it covered in white, chalky spots or rainbow streaks? Those stains are calcium and magnesium crystals—hard water’s calling card. If your glasses look like they’ve been dusted with baby powder, your softener is failing.
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The Best Water Softeners The Spruce Has Tested
Run a clean glass under your tap, let it air dry. No spots? You’re golden. Spots everywhere? Time to investigate, friend. (Pro tip: check the dishwasher too—spotty plastic cups are the ultimate betrayers of a dead softener.)
The “Bubble Timer” Method (My Favorite)
This one’s for the impatient. Fill a bucket or a large cup from your kitchen sink. Add a tablespoon of dish soap and stir gently—don’t splash like a toddler. Now, count how long until the bubbles disappear. In soft water, bubbles laugh in the face of time—they last minutes. In hard water, they vanish in thirty seconds or less, like they got scared.
If your bubbles die faster than a vampire in sunlight, your resin tank is probably exhausted. That’s your cue to check the salt level before you get too dramatic.
