Aqua-Polish, like SEAGULL IV cartridges, employ "structured matrix" technology, incorporating high-efficiency adsorption materials. The Aqua-Polish matrix is rated at 3 micron retention which is small enough to physically remove microscopic and visible dirt and scale sediment, and many other larger particulate contaminants. Aqua-Polish cartridges provide maximum flow rates and capacity while remaining superior to many other filtration products in effectiveness. Aqua-Polish cartridge is a filtering device, not intended to remove microbiological contaminants. Length / Diameter: 10.1 x 2.75 . Rated Flow = 5 g/m with a 5,000 US gallon (19,000 ltr) nominal capacity.