When only one faucet has weak flow, compare its hot and cold sides. Weak flow on both sides can point to a shared part of that faucet, such as the outlet aerator. Weak flow on one side can point toward that supply connection or the faucet valve.
Compare the symptoms at nearby fixtures
Run another fixture normally and note whether its flow is affected. If the problem began after a water shutoff, mention that timing. Debris can move through a line when service returns and collect at a small opening.
Tell the plumber what changed
Share the faucet model if available and whether the stream is weak, uneven, or stops intermittently. If other fixtures also lose flow, report when that happens so the plumber can consider a shared supply issue.
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