If one shower in your home has strong water pressure while another bathroom suffers from weak flow, the issue is localized to that specific shower fixture rather than a whole-house supply problem. The most common causes include a mineral-scaled showerhead, a partially closed supply stop behind the access panel, or a failing pressure-balancing cartridge inside that particular mixing valve. Verification: Unscrew the weak showerhead and inspect it for white calcium crust to isolate the restriction.
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