Interpet - Monthly Service Kit Floss/Carbon - PF3 - 3 PackInterpet PF3 Monthly Service Kit is a kit used containing unique bonded carbon and poly pads which are required to be replaced ever month. The specially bonded carbon and poly pad is designed to ensure your aquarium is crystal clear and healthy. This is achieved by the poly part of the pad removing fine particles to polish the water whilst the carbon removes colours, toxins and odours from the water. For best results replace every month to ensure a