I got this information from a respected California plumber.
Some pre-WWII houses have such high quality galvanized water pipes that they show no corrosion or build-up, because the metal and the galvanizing was of the highest quality.
Some new homes have such inferior galvanized pipe with poor quality metal and very thin ,shoddy galvanizing that they do not last even 10 YEARS !!
Can you imagine, spending all those super-inflated $100,000s to buy a house/HOME ,,, and not discover until maybe 10 years later ,,, that the galvanized water pipes were so inferior in manufacture,,,you have to spend $$$$$ to replace all of them !!?
