When water pressure is weak in only one specific bathroom while remaining entirely normal in other areas of the house, the restriction is isolated to that room's individual supply lines or fixtures. This is usually caused by clogged faucet aerators packed with calcium scale, partially closed supply shut-off valves under the sink, or a failing shower pressure-balancing cartridge. Over time, hard water minerals accumulate inside the tiny mesh screens of that specific bathroom's fixtures, choking off water flow without impacting the rest of your home's plumbing system. Verification: Unscrew the sink aerator and clean out any trapped mineral sediment to confirm whether water flow improves.
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