Fixing a slow-filling toilet system requires addressing water supply restrictions or internal fill valve clogs. First, fully open the wall shutoff valve behind the toilet by turning it counterclockwise. Second, shut off the water, remove the fill valve top cap, and clean out any mineral sediment clogging the internal inlet filter screen. Third, if the fill valve diaphragm is worn out, replace the cap assembly or install a new universal high-flow fill valve. Verification: Time the refill cycle with a stopwatch to confirm the tank reaches operating level within 45 to 60 seconds.
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