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  2. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Fresh water can have widely ranging pH values depending on the geology of the drainage basin or aquifer and the influence of contaminant inputs . If the water is acidic (lower than 7), lime, soda ash, or sodium hydroxide can be added to raise the pH during water purification processes. Lime addition increases the calcium ion concentration, thus ...

  3. Recirculating aquaculture system - Wikipedia

    en.wikipedia.org/wiki/Recirculating_aquaculture...

    Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. [1] Other types of filtration and environmental control are often also necessary to maintain clean water and provide a suitable habitat for fish. [2]

  4. Water ionizer - Wikipedia

    en.wikipedia.org/wiki/Water_ionizer

    Despite being described as 'water ionizers', the machines are designed to work as water electrolyzers. [3] This is an electrochemical process in which water is split to form hydrogen and oxygen by an electric current. [1] [18] In some machines, the process produces calcium hydroxide and hydrochloric acid through the use of an ion-exchange ...

  5. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    The pH range is commonly given as zero to 14, but a pH value can be less than 0 for very concentrated strong acids or greater than 14 for very concentrated strong bases. [2] The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. [3]

  6. Aquarium filter - Wikipedia

    en.wikipedia.org/wiki/Aquarium_filter

    The water trickles through the trays, keeping the filter wool wet but not completely submerged, allowing aerobic bacteria to grow and aiding biological filtration. The water returns to the aquarium like rain. [14] Alternatively, the wet/dry filter may be placed below the tank. In this design, water is fed by gravity to the filter below the ...

  7. Sump (aquarium) - Wikipedia

    en.wikipedia.org/wiki/Sump_(aquarium)

    The main advantage of having a sump plumbed into an aquarium is the increase of water volume in the system, making it more stable and less prone to fluctuations of pH and salinity, and also mitigating the effects of nutrient buildup or the unintentional introduction of foreign substances.

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