<p>1 Micron Filter Cartridge for ultra&#045;fine prefiltration system&#046; Coralife Pure&#045;Flo II Thin Film Composite &#040;TFC&#041; Reverse Osmosis Water Purification Systems generate purified water for aquarium use&#046; The units remove hardness, heavy metals, toxins and many oth</p><ul><li>12" x 4" x 4"</li></ul>