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Introduction to homemade fish tank filters There is a good filtration device in the fish tank,Only by keeping good fish and changing less water.First, the filtering methods mainly include physical filtration, biological filtration, chemical filtration, etc.Two, there are many types of filters in the form of filters,For example, air lift biochemical cotton filter, bucket external filter, top filter of aquarium, fish tank filter with shape, etc.1. air lift biochemical cotton filter sucks biochemical cotton into the upper air pump or water pump without bottom connection,The flow of gas in the water drives the flow of water to circulate in biochemical cotton.The residual bait, biological excrement and other organic substances in the water can be absorbed on the surface of the sponge.Advantages of gas lift biochemical cotton filter: simple structure, low unit price,Use it directly in the fish tank water.Disadvantages: the filtering principle is simple and the effect is poor,Clean bi