Why does rust colored water come out of shower head?
When water doesn't flow from a faucet and remains "standing", rust will collect if the pipe is galvanized (steel). Most new plumbing is copper, but may have galvanized pipe or fittings, too. Rust is composed of iron oxide flakes. Ingesting it in small amounts can give you the daily recommended (for males) dosage of iron. There are also filters that can be installed just before the showerhead.