In the unnatural environment of a home aquarium, a water filter system is essential. In nature, fish populations vary much less frequently depending on circumstances, fish waste is consumed organically, and lakes and ponds reach equilibrium. Home aquariums can never do that.
The density of fish in your home aquarium is very large compared to your average pond, so it is unlikely to reach equilibrium if water conditions remain acceptable. You can also buy Vortech Mp60 Powerhead W/ Quiet Drive (Mobius Ready) – Ecotech Marine for your aquarium.
We are talking about a "balanced" aquarium, which is based solely on filtering and changing the water regularly. An aquarium filter system needs to function in three ways, mechanical, biological, and, to a lesser extent, chemical.
Mechanical filtration usually removes large particles with foam or fiber pads. Often the filter media is graded from coarse to fine so as not to immediately clog the fine.
Biological filtration is done by developing colonies of beneficial bacteria that break down waste. One group of bacteria converts ammonia to nitrite and another group of bacteria converts nitrite to nitrate.
Chemical filtration is usually understood as the incorporation of activated carbon or ion exchange resin into a filter medium. Not needed every day, but with a new tank or after taking the medicine, all chemical contaminants are removed.
All filters work the same. Water is repeatedly passed through this type of filter media into the tank. As a rule, the water in the tank should be filtered 3 to 4 times an hour.
There are many types of freshwater filters for aquarium filters, all have their uses and some are better than others in certain properties.