Hydro Life Radial Flow Carbon Block Cartridge has several advantages. Water touches the entire surface of the filter for improved dirt-holding capacity and performance. Does not release carbon particles into the water being filtered. Water contacts the entire outer surface of the filter and percolates from the outside, so it has a high flow rate (2.5 GPM) Carbon block cartridges virtually eliminate chlorine and potential hazardous microorganisms and turbidity. Effective in reducing many other contaminants. Working pressure range: 20-100PSI