When the screen gets blocked with sediment or mineral build up, the water pressure from the faucet will become noticeably lower. The spray may also become erratic. Luckily, this is an ease fix. However, if you notice a drop in water pressure in more than one fixture in your home then the problem is in the system.
Clearing a Blocked Faucet Aerator
From Stephen Hallo III, former About.com Guide
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All kitchen and bathroom fixtures are equipped with an aerator located on the end of the faucet. The aerator's purpose is to add air to the water flow. This keeps the flow from spraying at an angle or with too much force. All aerators also contain screens to catch sediment that may be in the water line.
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