U - Aquarium and Fish Dictionary
- UGF :
- abbreviation for Under Gravel Filter.
- Ultraviolet Sterilizer :
- is aquarium equipment used to kill harmful parasites or other organisms in aquarium or pond water to prevent disease and algae problems. The UV Sterilizer works by slowing passing aquarium water over an ultraviolet light. The ultraviolet light reportedly destroys the cell structure of the organism, thereby killing it. Also see the UV Sterilizer article.
- Under Gravel Filter :
- is an internal aquarium filter that consists of plates that are placed under the substrate with rising corner tubes. Inside these corner tubes are air lines with attached air stones at the bottom. The air lines are attached to an air pump. The rising air bubbles create current that pulls water down through the gravel and up through the corner tubes attached to the undergravel plates. These filters were the popular choice back in the day, but have fallen out of favor with some of the easier to maintain aquarium filters of today (power filter). A UGF filter can perform mechanical filtration, biological filtration and chemical filtration. You can also set these UGFs up to do a reverse flow using a power head.
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