An American Standard toilet tank filling slowly is usually caused by a restricted wall supply shutoff valve, a clogged debris screen inside the fill valve assembly, or low water pressure. Modern American Standard toilets often use high-performance fill valves that feature an internal filter screen designed to catch pipe sediment; when this screen clogs with mineral scale, water flow slows to a trickle. Verification: Turn off the water, remove the fill valve cap, clean the filter screen of debris, and reassemble to restore rapid filling.
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