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There is a small localized spot or area of rust on my kettle / fermenter that I bought recently. I thought stainless steel can't rust?

Stainless steel itself shouldn't rust, you are right there.  Especially a high grade 304 Ss like we use on all of our products.  But what can rust are surface particles of iron that are sometimes left residual from the manufacturing process and the tools used to grind and polish the interiors and exteriors of Ss Brewtech's various vessels.  

This is one reason why proper cleaning and care prior to first use (or even exposure to water) is important.  We have detailed documentation both in the box and on our website on all the product pages.  The main thing here is cleaning and conditioning the stainless the first time prior to exposure to beer, water, whatever…

In any case, if you do see a localized spot(s) of surface rust  - simply get yourself a WHITE (NOT green type pad if you can avoid it) Scotchbrite pad, dab some Starsan onto the pad, and then GENTLY brush over the area in question until the surface rust has broken up and the area looks consistent with the surrounding areas of stainless.  Then just rinse off, dry it with a paper towel, and the area will be good to go and free of the surface layer iron particles that were causing the issue to begin with.

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