Using this Fluval FX Gravel Cleaner Kit is easy. First, connect the gravel vac to your Fluval FX4 or FX6 (2nd generation) canister filter. Make sure the connection is secure. Then, place the vacuum head into the substrate of your aquarium. You can use the thumb - operated flow control to adjust how fast the water and debris are being sucked up. As you move the vacuum head around, the grooved design will help collect debris more efficiently. The tube extension can be attached if you need to reach deeper parts of larger tanks. Remember, the Fine and Super Fine vacuum bags are sold separately, so you'll need to get them if you want to use that feature. When it comes to maintenance, after each use, rinse the gravel vac thoroughly with clean water to remove any remaining debris. Store it in the FX lid - mounted clips to keep it organized. Also, be careful not to let large objects enter the vacuum head as it might cause clogging. This kit works well in both freshwater and saltwater aquariums, but always make sure to follow the general care guidelines for your specific type of aquarium.