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Many older homes still have old galvanized iron water supply lines. Eventually they clog with deposits and water pressure and volume drop. Installing new copper tubing or CPVC tubing is one solution.As galvanized iron water lines age the interior of the pipe gets clogged with mineral deposits. Hot water temperatures seem to accelerate the growth of these deposits. The mineral buildup does not affect the water quality, but it indeed has an impact on the quantity of water the pipes can deliver.