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  2. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes

  3. 30000 series - Wikipedia

    en.wikipedia.org/wiki/30000_series

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  4. Backwashing (water treatment) - Wikipedia

    en.wikipedia.org/wiki/Backwashing_(water_treatment)

    Spent backwash water is either discharged without treatment to a sanitary sewer system or is treated and recycled within the plant. [4]: 22.37–22.40 Historically, backwash water was discharged directly to surface water supplies; however, direct discharge is now highly regulated through NPDES discharge permits and is often discouraged.

  5. Magnetic water treatment - Wikipedia

    en.wikipedia.org/wiki/Magnetic_water_treatment

    As magnets affect water to a small degree, and water containing ions is more conductive than purer water, magnetic water treatment is an example of a valid scientific hypothesis that failed experimental testing and is thus disproven. Any products claiming to utilize magnetic water treatment are absolutely fraudulent. [1]

  6. Evaporative cooler - Wikipedia

    en.wikipedia.org/wiki/Evaporative_cooler

    Water use. Evaporative coolers require a constant supply of water. Water high in mineral content (hard water) will leave mineral deposits on the pads and interior of the cooler. Depending on the type and concentration of minerals, possible safety hazards during the replacement and waste removal of the pads could be present.

  7. Odakyu 30000 series EXE - Wikipedia

    en.wikipedia.org/wiki/Odakyu_30000_series_EXE

    The Odakyu 30000 series (小田急30000形, Odakyū 30000-gata), branded "EXE/EXEα" ("Excellent Express/Excellent Express Alpha"), is an electric multiple unit (EMU) train type operated by the private railway operator Odakyu Electric Railway in Japan on Odakyu Odawara Line and Odakyu Enoshima Line "Romancecar" services since 1996.