Avo its a auto self filtration technology no need to require any carbon or chemicals to remove the fungs or other wasted things in water.
Most of the time over feeding and fish feces are raised the ammonia level in water, which is poisonous to species.avo control the ammonia into nitrate maintain the good environment .
Avo raise the technology in aquarium efficiency filter used in Avo perfect are to place the led light and heater ,filter media maintain and many ways to help the live plants .