The AdEdge AD4510S Arsenic Reduction Cartridge is replacement filter for under the counter or POU (point-of-use) filters that require filtration right at the point where water is being used. It is specifically for use in places where the level of arsenic is high in water. The filter removes up to 99% of arsenic from water. With a nominal rating of 25 microns and a flow rate of 0.5 gpm, the filter cartridge is apt for any standard filter housing. It has a capacity of 3,000 gallons and the dimensions are 4 3/4" x 9 3/4" making it easy to fit-in any under sink spaces.