Undergravel filters for aquariums

Undergravel

— filters installed at the bottom of the tank. Aquarium substrate is used as the filtering material, so it is crucial to consider the particle size of the substrate and the depth of the bottom filter. Additionally, the placement of decorative items in the aquarium and the dense roots of plants should be taken into account, as they can obstruct water flow through the filter's pores, creating "dead zones" where sedimentation can occur.