What is that whitish, flakey build-up I sometimes find on my showerheads or faucet aerators?

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What is that whitish, flakey build-up I sometimes find on my showerheads or faucet aerators?

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The build-up you see may be calcium deposits from your hot water heater. Over time, calcuim deposits can build up in your hot water heater tank. To prevent this from happening, you should flush your hot water heater tank in accordance with the manufacturer’s instructions.