This Fluval 407 Canister Filter ANNUAL Maintenance Kit PLUS Bundle has 10 Items: the Fluval 406/407 Filter Replacement Bio-Foam Value Pack (Fluval A337); Fluval 307/407/306/406 Filter Replacement Quick-Clear Water Polishing Pad, 6-Pack (Fluval A244); Fluval 306/307/406/407 Filter Replacement Ammonia Remover Pads, 6-Pack (Fluval A258); Fluval 306/307/406/407 Filter Replacement Phosphate Remover Pads, 6-Pack (Fluval A261); Fluval 306/307/406/407 Filter Replacement Nitrite Remover Pads, 6-Pack (Fluval A264); Fluval BioMax Media 500 grams (Fluval A1456); Fluval Carbon, 3 X 100 Gram Packs (Fluval A1440); Fluval Replacement 407 Magnetic Impeller (Fluval A20169); Fluval Replacement 307/407 Motor Seal Ring Gasket (Fluval A20064); Inland Seas Silicone Grease, 1cc; & a MarineAndReef Cleaning Towel. This Fluval 407 Canister Filter ANNUAL Maintenance Kit PLUS Bundle contains all the media & replacement parts Fluval recommends for replacement on an annual basis in order to prevent reduced filter performance or sudden failure. Be sure to unplug your filter before cleaning. Replace your media with all the included media. This includes the Quick-Clear Water Polishing Pad & Carbon, which should be replaced every month, and the Bio-Foam Value Pack (Bio-Foam, Bio-Foam Max and Bio-Foam+), which should be replaced every six months. Also included are the Ammonia Remover, Phosphate Remover & Nitrite Remover. These are all optional pads, but if you use them they should be replaced monthly. The MarineAndReef Aquarium Cleaning Towel is a durable, lint-free microfiber towel. 19" X 15".