Recently I installed a whole house reverse osmosis (RO) system. It was working great for a couple of weeks, unfortunately I didn't do all my research about RO and its affects on metal pipes.
Recently my water started having a brown tinge and metallic smell to it. Looking into I found that RO water will corrode metal piping. So I immediately disconnected the RO system.
My understanding is that there is a zinc coating on the pipes to help protect from corrosion, and I fear the first few weeks of nice looking RO water was my zinc coating protecting the iron, but the zinc has been corroded away and now the iron is exposed. The pipes were already pretty old, I estimate 70 years or when the house was built. Is this an accurate understanding of galvanized piping? Is the zinc coating gone, and the pipes will fail sooner than later now?