For the ultimate in convenience, choose Assembled Whisper Bio-Bag Cartridges. Like the unassembled, the packages are color-coded, making it easier than ever to remember which size to purchase.
Use Instructions: 1. Rinse Bio-Bag under cool tap water to remove carbon dust.2. Open lid and insert Bio-Bag into filter.3. Replace clogged Bio-Bag when there is reduced water flow out of the filter.