I have a peculiar issue. In my home with copper pipes, the main bathroom faucet has water that tastes VERY metallic. It is only this tap in my entire home that has the issue. I have read that acidic water can cause problems with copper pipes, but our tap water is a close to liquid rock as it can get (very alkaline, very hard, high ph). The issue showed up a couple of months ago, and I am wondering what might be the problem. I can fix plumbing stuff, just don't know a lot about it, so any input would be greatly appreciated. Thanks!