The second stage of chemical filtration: chemical adsorption filter materials such as activated carbon, ammonia-absorbing stone, zeolite and clear water resin are placed (note that the adsorption effect of such filter materials is generally only three months and must be replaced).
The third stage of biological filtration: the first stage: placing biochemical cotton (note: it is best to choose the one with appropriate pore size, high strength, high elasticity and high filtration speed).
The fourth stage of biological filtration: the second stage: placing biochemical balls (note: the capacity of this stage is greater than the number of biochemical balls as much as possible).
The fifth stage of biological filtration, the third stage: placing porcelain rings (note: the higher the water absorption of porcelain rings, the better; The higher the surface roughness, the better).
Extended data:
Biochemical filter materials for fish tanks are divided into three categories:
The first category is neutral filter materials, which refer to common basic filter materials that will not change the water quality, such as biochemical cotton, brushes, biochemical balls, time balls, ceramic rings, bacteria rooms and so on.
The second category is functional filter materials, which refer to common alkaline filter materials that will change the water quality of fish tanks, such as zeolite, medical stone, coral sand, activated carbon, volcanic rocks, etc., which either interfere with the pH value of water or interfere with the chemical composition of water.
The third category is composite filter media, which refers to a wide variety of secondary processing filter media in the market, such as NO 1 in Taiwan Province Province, GAE, Xiao Lang, Enoch and so on. Most of them are expensive and have regular shapes.