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Debris Collecting in Mixing Valve Screen

3 months ago

I have a Ruud heat pump hot water tank. We were getting a large amount of sediment collecting in the screen of the mixing valve, which was then affecting our water pressure. Ruud agreed to replace the tank. When the plumber removed the old tank (only 3 years old), he noticed that it was already rusting. The new tank has been installed for about a month but sediment is still collecting in the mixing valve. The sediment is only collecting on the hot water side - the cold water side is clear. What could posssibly be causing this? The plumber is also perplexed.

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