To fix low water pressure in a shower, start by unscrewing the showerhead from the arm and soaking it in warm white vinegar for 45 minutes to dissolve hard water calcium and lime scale clogging the spray nozzles. You can also remove the internal plastic flow-restrictor disk. If low pressure persists, ensure the mixing valve supply stops behind the wall are fully open or replace a worn pressure-balancing cartridge. Verification: Turn the shower on to verify that spray velocity and flow volume have been fully restored.
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