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  2. Hard water - Wikipedia

    en.wikipedia.org/wiki/Hard_water

    A scale layer of CaCO 3 is neither precipitated nor dissolved. For LSI < 0, water is under-saturated and tends to dissolve solid CaCO 3. If the actual pH of the water is below the calculated saturation pH, the LSI is negative and the water has a very limited scaling potential. If the actual pH exceeds pHs, the LSI is positive, and being ...

  3. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    e. In chemistry, pH ( / piːˈeɪtʃ / pee-AYCH ), also referred to as acidity or basicity, historically denotes " potential of hydrogen " (or "power of hydrogen"). [ 1] It is a logarithmic scale used to specify the acidity or basicity of aqueous solutions.

  4. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water. The goal is to produce water that is fit for specific purposes. Most water is purified and disinfected for human consumption ( drinking water ), but water purification may also be carried out for a variety of ...

  5. Total dissolved solids - Wikipedia

    en.wikipedia.org/wiki/Total_dissolved_solids

    Total dissolved solids ( TDS) is a measure of the dissolved combined content of all inorganic and organic substances present in a liquid in molecular, ionized, or micro-granular ( colloidal sol) suspended form. TDS are often measured in parts per million (ppm). TDS in water can be measured using a digital meter.

  6. Drinking water - Wikipedia

    en.wikipedia.org/wiki/Drinking_water

    Drinking water. Drinking water or potable water is water that is safe for ingestion, either when drunk directly in liquid form or consumed indirectly through food preparation. It is often (but not always) supplied through taps, in which case it is also called tap water. Typically in developed countries, tap water meets drinking water quality ...

  7. Distilled water - Wikipedia

    en.wikipedia.org/wiki/Distilled_water

    The drinking of distilled water as a replacement for drinking water has been both advocated and discouraged for health reasons. Distilled water lacks minerals and ions, such as calcium, that play key roles in biological functions, such as in nervous system homeostasis, and are normally found in potable water. The lack of naturally occurring ...

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