Whisper Bio Bag Disposable Filter Cartridges Pet Supply. Pet Supply » All Pet Products » Tropical Fish » Ponds » Accessories » Equipment » Filter » Filter Carbon Filter • Filter Sleeves Filter • Filter Resins Filter • Foam Inserts Filter • Filter Pads Filter • Filter Cartridges Whisper Bio-Bag Disposable Filter Cartridges buy bestselling pet products, supply find reviews, ratings, prices List Price: $23.02 You Save: $0 Features • regular • 12-pack [ + Zoom ]   [ Buy Now ] Pet Products : Usually ships in 1-2 business days Whisper Bio-Bag Disposable Filter Cartridges Customer Reviews   1     2     3   ♥♥♥♥♥ 12 pack or 8 pack? I love the price and the performance of this product. I am lazy and usually pay Wal Mart a huge price for the three pack but get the convenience of assembled cartridges that I don't have to fool around with the plastic insert frame. With the low price and free shipping I can easily forgo the slight time of reusing the plastic frame. I only gave it four stars because the marquee advertised 12 but the box says 8 ?   1     2     3   Non User