When barely any water trickles out of a faucet, it typically indicates a severe blockage of mineral scale inside the aerator screen, a completely closed or broken water supply shutoff valve, or a heavily pinched flexible supply line. In rare cases, a main water supply pipe break or a malfunctioning pressure-reducing valve can starve individual fixtures of water. Verification: Unscrew the aerator tip; if water gushes out strongly without the aerator, the screen is severely clogged with calcium deposits.
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