Using this foam filter is easy. Just install it in your Cleanstar 3 - in - 1 carpet extraction machine as per the machine's manual. When using, make sure the machine is turned off and unplugged. For maintenance, regularly check the filter for dirt and debris. If it looks dirty, you can gently wash it with mild soap and water. Let it dry completely before reinstalling. Keep in mind that although it may fit other similar machines, it's best to check your machine's compatibility first. Also, always follow the safety instructions of your carpet extraction machine when handling the filter.