Whisper Extra Large Bio-Bag Refills

Authentic Whisper Filter Bio-Bag disposable cartridges. Each cartridge consists of a plastic frame that is surrounded with a white filter bag that is filled with activated carbon. The plastic frame is specially designed to increase aerobic bacterial action by up to 200%. The fluffy filter bag is designed to remove larger particles from the aquarium water. The ultra-grade carbon is of the highest quality and will help to move odors and organics from your tank water. Fits the Whisper 4 and 5 models. Each cartridge measures approximately 6-1/2" x 9".