Work with Gen 1, Gen 2, and Gen 3 as replacement filter Roll. Replacement Filter Fleece for the ClariSea SK-3000 Automatic Filter Systems Keep your ClariSea filter system running perfectly with replacement fleece rolls. Each roll is 131 feet long and can give you months of maintenance-free operation. Specifications: Roll Width - 4" Roll Length - 40 Meters (131 Feet)