Fluval 306 A212 Canister Filter w/Bio-Foam, Carbon & Polishing Pads Value pack includes the following media: Bio-Foam Filter Media, Carbon Nylon Bags, Water Polishing Pads Improved motor hydraulic performance that reduces maintenance frequency, increases flow rates and head pressure Enhanced water filtration performance for cleaner, healthier water Better biological filtration, with the addition of Bio-Foam media Sound-dampening impeller design for 8 to 15% quieter operation