Pitting

In metal pipes subject to corrosion, it can be anticipated that the pipes will leak after a certain time. This is referred to as "pitting" even though this is not actually entirely correct. Viewed classically, pitting occurs on metals as the result of a galvanic element. This is produced if two different metals, e.g. copper and iron, come together. This results in a voltage, like on a battery. The result is that the pipe starts to leak. Consequently, a section of brass must always be fitted in the case of mixed piping between the copper pipes and the iron pipes.

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Merus is capable of stopping pitting as the result of normal corrosion. Merus is not always able to prevent pitting as the result of differing elements since strong chemical forces act in such cases. 
Consequently, it is always advisable to install a dirt filter at the branch line to the building in order to prevent a different metal being entrained from the outside.