Fish Tank Non Woven Filter Cotton Material 

How often should filter media be changed?     When deciding what type of filter system to install, it is also important toconsider what type of filter fabric to use. There are many types of filter media, such as non woven filter fabric, but all have one or both of the following functions. Mechanical filtration function: Separate and filter out solid impurities from the water flow. Biological filtration function: Provide a large surface area, which is conducive to the growth of beneficial bacteria, thereby breaking down pollutants in the water.     Before finalizing the filter media selection, first consider the following questions. What kind of jobs is this medium best suited for? Is it used to filter solid impurities or to support millions of beneficial bacteria to complete biofiltration? The answers to these important questions can guide you in the use of different filter media at different stages of filtration. Also consider wh…