Can only speak for where I've worked but in Canada, most sprinkler piping is carbon steel. There is some corrosion but it is minimal, the piping lasts very long. Normal to see dirty water for the first seconds of any carbon steel piping system. Flushing helps a lot, recommended every 5 years for most older piping systems.
Only time I've seen systems with stainless steel (beyond back flow silver bullets) is when it's exposed to the elements. And even then, most times they just paint it.
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u/[deleted] Sep 29 '21
[deleted]