Filters For Aquariums

 1. undergravel filters

undergravel filter (under)

Undergravel filters are one of the oldest filter systems. But with undergravel filters you will probably  need a external filter because undergravel filters do not have a place to put activated carbon wich most fish tanks need.

 2. Power filters

Power filters are a kind of hang on the back filter They have and inflow tube were water from the tank is sucked up , the water then passes through a carbon which should be replaced every few  months

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