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Purification of water, or filter system is very important to keep a beautiful scenery for a long time in the Nature Aquarium.
Filtration media can be classified into three categories by their function inside of filter. One is physical filtration, filtering tiny objects in water by fine filtration media. When the filtration got clogged, it is necessary to clean the media.
The second is absorption filtration (chemical filtration), using filtration media with porous surface, such as activated carbon through water and let absorb unnecessary object. Absorption capacity depends on filtration material, but this absorption filter requires regular exchange when the capacity lowers.
And the third is biological filtration and it is the most important filtration for the Nature Aquarium. Ammonia, generated from fish’s excretory substance and dead leaf, is harmful for fish, but it is going to be turned into harmless nitric acid by nitrifying activity of microorganisms in the filter. Other organic substances are also biodegraded by bacteria, and the water gets purified.