TETRA Whisper® Bio-Bag® Replacement Cartridges

For the ultimate in convenience, choose Assembled Whisper® Bio-Bag® Cartridges. Packages are color-coded, making it easier than ever to remember which size to purchase.Fits:Small-3i InternalMedium- PF10 Power Filter, 10i Internal and Reptofilter 90 GPHLarge- 20, 30,40 and 60 Power Filters and 20i & 40i Internals Instructions Rinse Bio-Bag• under cool tap water to remove carbon dust. Open lid and insert Bio-Bag into filter. Replace clogged Bio-Bag when there is reduced water flow out of the filter. For best results, change Bio-Bag monthly or sooner, if required.