How to Test Hard Water

How to Test Hard Water

How to Test Hard Waterの方法についてポイントを解説します。分かりやすいガイドをチェックしてください。

Take a clear drinking glass. Wash it normally, then let it air dry. Don’t wipe it.

When it’s dry, hold it up to the light. See those white spots and streaks? That’s mineral residue. It’s like your glass is wearing sunglasses made of rock.

If you spot a cloudy film that won’t rub off, congratulations—you’ve got hard water. Your glasses are literally turning into stone. But hey, at least they’re unique, right?

Water Hardness Test Strips: How to Read & Use Them (2026)Water Hardness Test Strips: How to Read & Use Them (2026)

The “Feel” Factor (Weird but True)

Here’s a trick: after washing your hands, rinse them, and then don’t dry them. Rub your fingers together. Does your skin feel slippery and slick?

That’s actually normal. Soft water leaves a little soap behind. Hard water? It makes your skin feel sticky and filmy, like you’ve been wrestling a potato.

If your hands feel like sandpaper afterward, you’ve got hard water. Your lotion budget is probably crying already.

木村 陽翔
Author

木村 陽翔

デジタルガジェットとスマート家電の検証記事を多数執筆。失敗しないモノ選びを提案します。