Tetra Whisper® Bio-Bag® Replacement Cartridges Size:Large, 3 ct Flat steak-house style grids

Flat steak-house style grids

Because the crate folds

Formulated to meet the unique needs of indoor cats

The pail holds up to two weeks of cat litter (for one cat)

Classic great taste since 1926

Tetra Whisper® Bio-Bag® Replacement Cartridges Size:Large, 3 ct Flat steak-house style gridsFor 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 Internal Medium PF10 Power Filter, 10i Internal and Reptofilter 90 GPH Large 20, 30,40 and 60 Power Filters and 20i & 40i Internals 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