This Fluval FX4 Canister Filter Annual High Performance Maintenance Kit Package includes SEVEN items: the Fluval FX Filter Bio-Foam Pads 2-Pack (Fluval A239); Fluval FX Filter Bio-Foam Block 3-Pack (Fluval A228); Fluval FX Filter Carbon Foam Pad 2-Pack (Fluval A249); Fluval BIO-FX Premium Biological Filter Media, 5L (A1459); Fluval FX4 Impeller Assembly (Fluval A-20208); Fluval FX4 Motor Seal Ring (Fluval A-20211); and the Inland Seas Super Lube Silicone Lube, 1cc.

NOTE: According to Fluval: "Changing your impeller is proven to prolong the life of your filter."

Fluval's FX Canister Filter Annual Maintenance Instructions:
To prevent sudden failure or reduced performance, Fluval suggests the following maintenance be performed every year on their FX Series Canister Filters:

• Unplug the filter prior to cleaning
• Replace the Impeller. Clean and lubricate the included Motor Seal Ring & AquaStop O-Ring Gaskets (with the included Inland Seas Super Lube Silicone Lube).
• Check and clean the intake Stem/Strainer
• Check and clean the Ribbed Hosing
• Replace the included Bio-Foam Pads (every six months)
• Replace half of the included Bio-Foam Blocks (every six months)
• Replace the included Carbon Foam (every month)
• Replace half the included Bio-FX and rinse the other half (every six months)

Further reading:

• Fluval FX5 Canister Filter User Manual
• Fluval FX4/FX6 Canister Filter User Manual