HomeWhy is it necessary to maintain a healthy aquarium? What is a chemical environment?Why is it necessary to remove waste products from the aquarium?How do filters keep the aquarium clean? How does biological filtration work?

How does biological filtration work?
      Biological filtration is the use of biological agents (like bacteria) to remove toxic wastes (like ammonia) by converting them into less toxic wastes. Bacterial growth occurs in porous surface areas. For instance sponges, rock and gravel can act as substrate for bacteria.

What are the functions performed by bacteria?
What is substrate?
What are some different kinds of filters?