Brand new - never been used stainless steel briage pot pitted with one 6 minute water boil on my gas range I had pitting in an All-Clad pot and figured I had done something wrong ( no salt added at all just water boiled).  The new pot ( received yesterday) .. washed with hot water and soap, cleaned, dried and commenced to heating.. it's already pitting.. I live near Carlsbad, CA and I do believe the water here is quite &quot;hard&quot;.. ( chlorine, calcium)..    any suggestions appreciated.
Kevin
This is not pitting, this is scale. You can't prevent it, no matter what kind of pot you buy.
Washing/scrubbing won't really help. Get a descaling agent - no need to go for the expensive ones, maybe just get some citric acid in bulk - and descale whenever it builds up enough to bother you.