What is Fish tank 3 stage filtration?

This type of filtration is usually used in saltwater tanks. It involves the use of three different types of filter media, each of which removes a different type of waste. The first stage is mechanical filtration which removes large particles such as debris, uneaten food, and fish waste. This stage usually uses a filter sponge or mechanical floss.

The second stage of filtration is biological filtration which removes dissolved organic compounds and other toxins. This is done by beneficial bacteria that live in the second filter medium, usually ceramic rings or porous plastic bio-balls.

The third and final stage of filtration is chemical filtration, which removes any remaining toxins, impurities, and pollutants from the water. This is done by passing the water through a chemical filtration medium such as activated carbon.

Three-stage filtration aims to provide thorough cleaning of the water and is well suited for maintaining healthy saltwater aquariums.