Key Features 6x Replacement Foam for Interpet PF 1 High Quality Foams Simple to Clean and Replace Helps to Maintain a Clear and Healthy Aquarium Replacing your filter foams also reduces the need for constant cleaning and maintenance Replace your filter foams inside of your Interpet PF filter with compatible filter foams by Pisces. It is important to replace filter foams in your aquarium filter regularly to keep your water crystal clear and healthy. Replacing your filter foams also reduces the need for constant cleaning and maintenance. Use the drop down menus to choose your selected PF Filter and pack size that you require. Fits the PF Range of Interpet Filter Foams. Pack includes 6 foams for the PF 1.