CeraGrav LP-5 by AquaCera HDPE Gravity Filter System 2 Doulton Super Sterasyl Filters 2 by 7 inch Absolute rating: 0.5 Micron Nominal rating: 0.2 to 0.8 Micron Uses up to 5 filters for High flow rate LP-5 is 7 US Gallons (3.5 upper and 3.5 lower)