What is the core made out of - it isn't a copper unit by any chance? The reason I ask is because this sounds like a copper pipe plumbing problem where little pieces of another metal (usually iron from an old hot water tank) get deposited along the inside of a horizonal lengths of copper pipe, Corrosion then is quite fast and results in pin-hole leaks everywhere. Is it possible that there is a similar chemical reaction between two metals in your system?? Just an idea.....
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