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Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > Rust(?) Spots in new Keggle
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Old 03-11-2012, 06:37 PM   #1
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Default Rust(?) Spots in new Keggle

I'm in the process of setting up a new keggle and HLT, hoping to brew with both next weekend, and yesterday I noticed what appear to be a handful of rust spots in the bottom of the keggle.

Now, these could be beer stone - I've never seen the stuff before, so I'll admit I could be mistaking the one for the other. So, a picture to help identify:



What's the best way to handle this? I do not have an angle grinder, but I do have a few different drills and such, and plenty of elbow grease to apply.

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Old 03-11-2012, 07:21 PM   #2
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Do not try to grind away the rust, it will just get worse fast

Hydrocloric azid and a kitchen scrubby/sponge thingy
You will need chemical gloves and need to work outside
Rinse well and set to dry

I hear barkeepers friend work too

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Old 03-11-2012, 07:39 PM   #3
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Barkeepers friend is what I used for same issue. Store your keggle dry going forward and you won't have a problem.

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Old 03-11-2012, 07:55 PM   #4
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Beer stone, at least what I saw in my kegs after cutting them open, is a hard, light-colored, almost chalky surface coating.

How did you cut your lid? Plasma torch? Those spots almost look like slag marks on the bottom?

Bar Keeper's friend should take care of it. I wouldn't recommend using hydrochloric acid ... it will further deteriorate the passive layer on the stainless, making the rust worse.

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Old 03-11-2012, 08:57 PM   #5
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Yeah, had it cut with a plasma cutter... If they're slag spots, any differences in how I deal with them?

Thanks for the advice so far!

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Old 03-11-2012, 09:42 PM   #6
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Beerstone (Calcium oxalate, as 'beerstone', is a brownish precipitate that tends to accumulate within vats, barrels and other containers used in the brewing of beer. If not completely removed in a cleaning process, beerstone will leave an unsanitary surface that can harbour microorganisms.[1] Beerstone is composed of calcium and magnesium salts and various organic compounds left over from the brewing process; it promotes the growth of unwanted microorganisms that can adversely affect or even ruin the flavor of a batch of beer.) does not occur until you have actually used the kettle.

When the keggle was cut hot slag landed in those spots forcing the chromium in the steel away from the surface. The surface must be repassivated. An acid is required to draw the chromium back to the surface. The method janivar123 mentioned will work fine. When welding stainless we use Star San concentrate (machine shops use nitric acid).

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Old 03-12-2012, 01:32 PM   #7
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So, if I'm getting this right, I need to use some sort of acid solution (sounds like a higher concentration of starsan - what concentration would be good here? 1oz:1gallon? more/less?) and a SS scrubby to get rid of the rust and re-passivate the stainless. And then maybe hit the whole thing with a good scrub down with bar keeper's friend for good measure?

And if the starsan solution won't do it and I need to use something stronger, where would I go to acquire it? What exactlty would I look for?

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Old 03-12-2012, 01:49 PM   #8
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Im guessing consentrate mean undiluted star-san
I wouldnt use a metal scrubby, kitchen sponge with the green scrubby surface should be plenty

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Old 03-12-2012, 05:09 PM   #9
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a few drops of Star San on the keggle bottom and a plastic scrubby... then clean up with Barkeepers Friend

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Old 03-12-2012, 09:09 PM   #10
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Quote:
Originally Posted by stratslinger View Post
So, if I'm getting this right, I need to use some sort of acid solution (sounds like a higher concentration of starsan - what concentration would be good here? 1oz:1gallon? more/less?) and a SS scrubby to get rid of the rust and re-passivate the stainless. And then maybe hit the whole thing with a good scrub down with bar keeper's friend for good measure?

And if the starsan solution won't do it and I need to use something stronger, where would I go to acquire it? What exactlty would I look for?
All you need is Bar Keepers Friend and a sponge. Don't use too much water - you want it to be like a thin paste.
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