Use ultra-small carbon austenitic stainless steels, including 304L and 316L, can reduce the formation of chromium carbide and reduce the probability of chromium-depleted envelope. That aside, I have a 10 gallon simple 304 stainless pot which i used For many years as an extract brewer and my start into all https://www.youtube.com/watch?v=aScUyjIFIYY