A filter in a fish tank performs three primary functions: cleaning debris, removing toxic substances, and aerating the water.
Here's a breakdown of each function:
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Mechanical Filtration: Removes solid waste and debris, such as uneaten food, plant matter, and fish waste, making the water clearer.
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Biological Filtration: This is arguably the most crucial function. Beneficial bacteria colonize the filter media and convert harmful ammonia and nitrites (produced by fish waste) into less toxic nitrates. Without this process, ammonia and nitrite levels would quickly rise to lethal levels for fish.
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Chemical Filtration (Optional): Some filters incorporate chemical filtration, using substances like activated carbon to remove odors, discoloration, and other impurities from the water.
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Aeration: Many filters also help aerate the water by creating surface agitation, which facilitates oxygen exchange. Fish need oxygen to breathe.
In summary, a filter keeps your fish tank water clean, safe, and oxygenated, creating a healthy environment for your aquatic pets.
