Using this Bosch Readyy'y outer filter is easy. First, turn off and unplug your cordless vacuum. Open the dust container unit and locate the old filter. Remove it and replace it with this new outer filter. Make sure it's properly seated. When using your vacuum, don't overfill the dust container as it can put extra strain on the filter. For maintenance, clean the filter regularly. You can gently tap it to remove large debris or wash it under lukewarm water if it's washable (check the product manual). Let it dry completely before reinstalling. If you notice a significant drop in suction or the filter is damaged, it's time to replace it.