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If the fill valve is black and gray or a rust brown color it is probably a "Fluidmaster" brand fill valve and has a seal that goes bad over time. A very easy fix. Go to your favorite plumber or DIY house and ask for a seal kit (one part). Turn off the water, grasp the top, with the arm up, and twist 1/8th turn counter clockwise, remove the old seal and swap with your new one and put the top back on. The fix is as quick as you can read this. Turn on the water and pat yourself on the back for another job well done.
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