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  2. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    Since these systems do not work by exchanging ions, like traditional water softeners do, one benefit claimed for the user is the elimination of the need to add salt to the system. Such systems do not remove minerals from the water itself. Rather, they can only alter the downstream effects that the mineral-bearing water would otherwise have.

  3. Comparison of anaerobic and aerobic digestion - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_anaerobic...

    In both aerobic and anaerobic systems the growing and reproducing microorganisms within them require a source of elemental oxygen to survive. [1] In an anaerobic system there is an absence of gaseous oxygen. In an anaerobic digester, gaseous oxygen is prevented from entering the system through physical containment in sealed tanks.

  4. Aerobic digestion - Wikipedia

    en.wikipedia.org/wiki/Aerobic_digestion

    Aerobic digestion is a process in sewage treatment designed to reduce the volume of sewage sludge and make it suitable [1] for subsequent use. [2] More recently, technology has been developed that allows the treatment and reduction of other [ 3 ] organic waste, such as food, cardboard and horticultural waste.

  5. Aerobic treatment system - Wikipedia

    en.wikipedia.org/wiki/Aerobic_treatment_system

    The aeration stage and the disinfecting stage are the primary differences from a traditional septic system; in fact, an aerobic treatment system can be used as a secondary treatment for septic tank effluent. [1] These stages increase the initial cost of the aerobic system, and also the maintenance requirements over the passive septic system.

  6. The Difference You Need to Know Between Costco and Costco.com

    www.aol.com/difference-know-between-costco...

    Here's one of the most important differences between shopping at Costco in-person vs online: Even if you can find the same item in both places, you may pay a higher online price.

  7. The 6 Differences Between Costco and Costco.com –Which One ...

    www.aol.com/finance/6-differences-between-costco...

    Here are the six differences between shopping at a Costco store or shopping online at Costco.com. Non-Members. One perk to shopping at Costco.com is that you don’t have to be a member. Non ...

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