The most common reason for low water pressure is the buildup of debris in the water line or aerator. You may need to flush out your faucet. Step One. Flush the aerator by removing it and then cleaning any dirt from the screens that may be causing a blockage. Replace the aerator and test the faucet to see if pressure has been improved. If the pressure has not improved, try step two. Step Two. You can flush your faucet water lines by first shutting off your water supply at the stop. Remove the index button of the handle, screw, and handle. Remove the cartridge or stem and flush thoroughly with water by turning the stop on slowly. Replace the stem or cartridge in the faucet in the exact position you removed it from and replace the handle assembly. Turn the water supply back on. Turn the handle to the open position and see if your flow has improved. If this does not take care of the problem please contact our Customer Service Department at 800-888-4458.