hj
Galvanized pipes in, or under, a concrete floor will be nothing but trouble. There is no way to prevent them from rusting, both internally and externally. The only sure about them is that they are going to fail eventually. How long a time before “eventually” is impossible to say. It depends on where and how the pipe was made, the quality of the soil it is buried in, and the amount of water used, among other things. If it were I, I would take a pass unless the seller is willing to reduce the price substantially to cover at least some of the cost of the eventual repiping.
