Using this Westinghouse fridge water filter cartridge is easy. First, locate the filter compartment in your fridge. It's usually in a visible and accessible place. Open the compartment and remove the old filter if there is one. Take out the new filter from its packaging. Make sure to check the orientation of the filter as indicated by the markings. Insert the new filter into the compartment and secure it properly. Close the compartment. That's it! As for maintenance, it's recommended to replace the filter every six months to keep your water and ice clean and fresh. If you notice a change in water taste or flow, it might be time for a replacement. When handling the filter, avoid touching the filtering surface with dirty hands to prevent contamination. If you're unsure about anything during the process, feel free to contact us.