Just like every living organism, fish constantly excrete waste. When waste is not removed from the aquarium, they accumulate and become potential poison to the fish and other residents of the aquarium. This is why it is highly essential to install aquarium filter systems to remove these toxins from the tank.
Water inside the aquarium can also be dangerous to the fish when the aquarium water gets oversaturated with toxic gas as a result of the nitrogen cycle. This phenomenon is called nitrogen embolism or nitrogen gas bubble disease. This can cause fish casualties. Properly aerating the aquarium water can avoid such mortalities.

Aquarium filter systems can help maintain healthy aquarium life. Filtration is the process of cleaning aquarium water by removing waste products, excess food, free-floating particles, decaying matters, and other harmful chemicals. Filters, or the tools used for filtration, come in a variety of types and sizes. These filters are also categorized based on where they are placed in the aquarium tank so there are inside, outside and sub gravel filters. However, they all share the same basic function. All filters circulate the aquarium water through a medium that strains or cleanses to keep the water biologically and physically clean.
Aquarium filters are made from a variety of materials. The simplest type consists of filter wool, which is an effective material for mechanical filtration, and activated carbon, which is a recommended medium for chemical filtration. Large particles are trapped by the filter wool while the smaller ones are absorbed by the activated carbon.
There are three major categories for aquarium filter systems, specifically biological, mechanical and chemical filtration.
Biological filtration removes bacteria and other forms of microorganisms found in the aquarium water. These kinds of filters convert waste products into substances that are less toxic through a process called cycling. Biological filters convert ammonia into nitrite, and then from nitrite to a relatively harmless chemical called nitrate.
Mechanical filtration helps maintain water clarity by acting as a sieve or mesh to trap and physically remove unwanted particles. Mechanical filters strain or use absorbent materials to remove solid wastes.
Chemical filtration removes toxins and other chemicals from aquarium water. These chemicals are introduced into the water when presenting fish medications or when performing water changes.
Aquarium filter systems are necessary for maintaining a healthy aquarium environment. They remove waste products, from solid particles to soluble chemicals, thereby simplifying aquarium maintenance. They also help support fish life by keeping their environment free from toxic gases and other chemicals that can cause casualties.
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