Restoring Kitchen Faucet Flow: A Step-by-Step Guide

Water pressure issues in the kitchen usually stem from a single, tiny culprit hidden in plain sight. Most modern faucets use an aerator to mix air into the water stream, which saves money and prevents splashing; however, this same device acts as a magnet for mineral deposits and debris. When that screen gets clogged, your once-powerful stream turns into a disappointing trickle. Restoring full flow is a satisfying project that rarely requires more than a pair of pliers and ten minutes of your time. If cleaning the aerator doesn't solve the issue, we move deeper into the supply lines and shut-off valves. When you're finished, you'll have a faucet that performs exactly as the manufacturer intended, without the expense of a plumber.

  1. Clear the mineral trap. Place a rag around the faucet head to prevent scratches, then use adjustable pliers to unscrew the aerator. Disassemble the internal screens and rinse them thoroughly under high pressure or soak them in white vinegar to dissolve stubborn calcium.
  2. Isolate the real problem. Unscrew the faucet sprayer hose if you have one, or run the faucet without the aerator to see if the flow improves. If the flow is still weak without the aerator, the blockage is likely in the supply lines or valves.
  3. Check the shut-off valves. Look under the sink at the shut-off valves and ensure they are turned fully counter-clockwise. Sometimes these valves get bumped or partially closed during under-sink cleaning.
  4. Pressure test the supply. Shut off the supply valves, disconnect the supply lines from the faucet base, and point them into a bucket. Briefly open the valves to ensure a full, strong stream of water is reaching the sink.
  5. Purge the cartridge. Remove the faucet handle and inspect the cartridge for debris. Sediment can sometimes become lodged in the intake ports of the cartridge, restricting flow to the spout.
  6. Test and finish strong. Reattach all connections firmly, hand-tightening first to avoid cross-threading. Open the supply valves slowly to check for leaks before turning the faucet handle to the full 'on' position.