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Faucet sounded a little higher pitched than usual, even though the flow seemed normal. So I unscrewed the aerator. All the brown grains are rust flakes that come from the inside of our old galvanized pipes. I'm pretty sure the light colored sandy stuff is just in the water supply that Arlington County delivers to us. I should install a whole house sediment filter or something. I end up replacing the valves in my fixtures every 5 years or so. They are being sand blasted.
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