Using your CleanStar Stellar 2 - in - 1 handheld vacuum with this lower filter is easy. Just remove the old filter carefully and place this new one in its position. Make sure it fits snugly. When using the vacuum, try not to overfill the dust container as it can put extra strain on the filter. As for maintenance, it's a good idea to check the filter regularly. If it looks dirty, gently tap it to remove large debris. You can also wash it with mild soap and water, but make sure it's completely dry before putting it back in the vacuum. By following these simple steps, your filter will last longer and your vacuum will work great.