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"So my question is - can the chrome to copper be the source of the green blue stuff. If so, will replacing the valve with brass be sufficient to solve the problem or are the copper pipe and tubes contaminated and doomed to produce the stuff. "
Simple answer: "YES". Chrome to copper 'can' be the source of the green blue stuff...."NO", replacing the valve with another metal will not help.
If a dielectric union is the cause of your green chunks, then placing a different metal against the copper will only continue the same dielectric union.
To STOP a dielectric union you must use a completely different material such a PVC plastic as a union between the 2 dissimilar metals.
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