Why do you get pinholes in copper pipe in new southern Californian homes[Plumbing Explained]

In this short video I explain to a customer why she is getting these pinhole Leaks in her copper plumbing system
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Please watch: "Shower drain clogged! Experienced plumber shows tricks of the trade"
https://www.youtube.com/watch?v=nL1vdWJwadw
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Видео Why do you get pinholes in copper pipe in new southern Californian homes[Plumbing Explained] канала Plumbing Explained