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Low hot water pressure

When turning on hot water, the pressure drops. There is 75psi at main and cold water is fine it's just when I use hot water or warm in shower when pressure goes down. The water heater is old (20 yrs) and had sat idle and empty for 2 years(repo) and when I fired it up, lots of crackling soulds like salts in tank. Could this possibly be the culprit?

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