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Tetra's Whisper Bio Bag comes in a convenient 3 pack. Simply replace and discard each filter about once a month or whenever there is a slow in the water flow. Replacing cartridges results in happier fish, crystal clear water, and the carbon removes odors and water discoloration.
Fits Whisper Filters PF-20, 30, 40, 60, and IQ-20, 30, 45, 60.
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Visit Manufacturer's website: www.tetra-fish.com
Whisper Aquarium Power Filter Bio-Bag Lg 3-pack