For 2005-2008 Sundance 880 Series Spas. High Flo Recirculation Filter. Spun Bound. This is the Sundance Factory Filter. Not retrofittable to any other Series. It is a single stage Microclean filter. Measurement: Height 19", Diameter 8.5", Hole 2.5", 125 Sq. ft. Used on: Altamar 2006-2008, Cameo 2005-2008, Capri 2006-2007, Majesta 2005-2008, Marin 2006-2008, Maxxus 2005-2008, Optima 2005-2008 NOTE: Newest version from Sundance does not have the outside blue mesh, they now are all white pleated material with no mesh and are part number 6540-507. Sundance no longer makes the 6540-505, you will receive the 6540-507 which is the white pleated material. Note: Do Not Use any filter cleaners or water clarifiers with this filter. It will prematurally, clog up and will not be useable. They are designed as throw aways to last up to 9 months. MicroClean Filtration System • MicroClean Plus is the most robust, efficient system available • Traps virtually all particles, large and small • Removes oils and lotions from the water • MicroClean Plus filter lasts up to 9 months for reduced maintenance and replacements costs • No leaching of chemicals from pure fiber filter • Similar technology used in home drinking water We recommend Leisure Time Enzyme Cleaner to help to prolong your filter. The Enzyme helps to break down the oils that clog up a filter, giving it longer life! Can use 6540-488 Filter to take the place of the two filter system. It would give you a single large filter with a divided wall for the circulation pump system that is cleanable.