The Marineland Rite-Size Bonded Filter Sleeve is specially designed to prolong the life of filter media by reducing the accumulation of waste and dirt particles which can prematurely clog a filter. Resilient fibers trap and hold small dirt particles while the sleeve's porous, open-cell construction promotes water flow...without impairing overall filter performance. Custom designed for the Magnum 220/350 Carbon/Media Container and Micron Cartridge.

For Best Results: Rinse or replace sleeve monthly.