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: 5.1 x 2.75. Rated Flow = 3 US g/m with a 2,500 US gallon (9,500 ltr) nominal capacity.