This is a 3 pack of Fluval Bio Screen Filters (14021) for the Fluval C3 Aquarium Filter System (14002). These Fluval Bio Screen filters are used as the Stage 4 biological filter media in the Fluval C3 Aquarium Power Filter System.
These Fluval Bio-Screen filter replacements for the Fluval C3 Aquarium Filter block debris from entering the final (Stage 5) biological filter stage. The specially designed micro weave core of these Fluval Bio Screen filters provide a large surface area for more thorough filtration to protect the Fluval Stage 5 Biological Trickle Chamber with Fluval C-Nodes from clogging.
Fluval C3 Bio Screen replacement filters should be changed approximately every 1-2 months for optimum performance, though they can be rinsed to extend filter life. This three pack of Fluval Bio-Screen replacement filters is also known by Hagen part number 14021.