Designed for use with your API Filstar XP Filter, this three-pack of API Filstar XP Micro Filtration Pads leaves behind healthy, crystal-clear water. These filtration pads are designed with a unique three-layer microfiltration technology that thoroughly cleans and filters water using mechanical, chemical and biological levels. This fine-quality cotton filter pad removes even extremely fine waste, sediment and particles from your aquarium water to create a healthy environment for your fish and marine plants.