Filter cartridges keep the water in your hot tub clean. They are easy to install and maintain.^Just rinse it regularly under the tap. ^However, if they remain dirty or discolored after rinsing, they should be replaced. ^Otherwise, the filter pump may be damaged. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it