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2. Hard Water and Soft Water: Differences, Advantages, and ...

   www.healthline.com/health/hard-water-and-soft-water

   The hardness of water is determined primarily by the amount of calcium and magnesium it contains. Higher levels of these and other minerals make water hard. Water softening systems work by ...

3. Tap Water: How Do I Know if it's Safe to Drink? - WebMD

   www.webmd.com/.../features/is-my-tap-water-safe

   Water is soft if it has 17 parts calcium and magnesium per million or less. Water is slightly hard if it has 17 to 60 parts per million. Water is moderately hard if it has 60 to 120 parts per ...

4. Why You Should Stop Using Tap Water to Clean Your Face

   www.healthline.com/.../tap-water-bad-for-skin

   With average pH levels of 7, chances are your tap water is hurting your skin. The pH scale measures the acidity or alkalinity of a water-soluble substance (such as the surface of your skin or ...

5. Tap Water vs. Bottled Water: Which Is Better? - Healthline

   www.healthline.com/nutrition/tap-water-vs...

   However, tap water is generally a better option, as it’s just as safe as bottled water but costs considerably less and has a much lower environmental impact. Plus, with a reusable water bottle ...

6. Safe Drinking Water: Tap Water, Bottled Water, and ... - WebMD

   www.webmd.com/diet/safe-drinking-water

   Give them bottled water or water that's been boiled and cooled. Bring the water to a full rolling boil for 1 minute, or 3 minutes if you're above 6,500 feet in elevation. Looking after plants. Tap ...

7. Understanding Water: What Makes Water Hard or Soft? - WebMD

   www.webmd.com/.../difference-between-hard-soft-water

   The hardness or softness of water is determined by the mineral content of both calcium and magnesium: Soft water has less than 17 parts per million. Slightly hard water has 17 to 60 parts per ...