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2. Portable water purification - Wikipedia

   en.wikipedia.org/wiki/Portable_water_purification

   UV-treated water must therefore not be exposed to visible light for any significant period of time after UV treatment, before consumption, to avoid ingesting reactivated and dangerous microbes. Recent developments in semiconductor technology allows for the development of UV-C Light Emitting Diodes (LEDs). UV-C LED systems address disadvantages ...

3. Koi pond - Wikipedia

   en.wikipedia.org/wiki/Koi_pond

   An ultraviolet light is used to make algae flocculate (form into clumps), so that they can be removed by mechanical filtration. The UV sterilizer will also kill free-floating bacteria in the pond water. And in some cases, the UV light can kill some types of pathogens in the water [3] that can infect the fish and possibly kill them.

4. Aquarium filter - Wikipedia

   en.wikipedia.org/wiki/Aquarium_filter

   A large shower biological filter designed to maximize the beneficial effects of the nitrogen cycle, in a koi pond. Proper management of the nitrogen cycle is a vital element of a successful aquarium. Excretia and other decomposing organic matter produce ammonia which is highly toxic to fish.

5. Water purification - Wikipedia

   en.wikipedia.org/wiki/Water_purification

   Ozone disinfection, or ozonation, is an effective method to inactivate harmful protozoa that form cysts. It also works well against almost all other pathogens. Ozone is made by passing oxygen through ultraviolet light or a "cold" electrical discharge. To use ozone as a disinfectant, it must be created on-site and added to the water by bubble ...

6. Turbidity - Wikipedia

   en.wikipedia.org/wiki/Turbidity

   Similarly, suspended solids can protect bacteria from ultraviolet (UV) sterilization of water. [ citation needed ] In water bodies such as lakes , rivers and reservoirs , high turbidity levels can reduce the amount of light reaching lower depths, which can inhibit growth of submerged aquatic plants and consequently affect species which are ...

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